diff --git a/.changeset/address-telephone-required-from-magento.md b/.changeset/address-telephone-required-from-magento.md
new file mode 100644
index 00000000000..ce86289afd3
--- /dev/null
+++ b/.changeset/address-telephone-required-from-magento.md
@@ -0,0 +1,17 @@
+---
+'@graphcommerce/magento-cart-shipping-address': patch
+'@graphcommerce/magento-customer': patch
+'@graphcommerce/magento-cart': patch
+---
+
+Address forms now honor Magento's `customer/address/telephone_show` configuration instead of silently submitting a `000 - 000 0000` placeholder telephone.
+
+`CartAddressInput.telephone` is a non-nullable `String!`, so the address forms always had to send a value; because the mutation variable is declared as an optional `String`, `required.telephone` resolved to `false` and the field rendered as optional, after which `onBeforeSubmit` substituted the placeholder. Every checkout that skipped the field therefore stored a fake phone number on the order.
+
+Magento does expose whether a telephone is required — `attributesForm(formCode: "customer_address_edit")` returns `is_required` per address attribute and reflects `customer/address/telephone_show`. `ShippingAddressForm`, `EditBillingAddressForm` and `EditAddressForm` now read that metadata through the existing `useAttributesForm` hook and mark the field required accordingly. The placeholder is gone: an empty telephone is submitted as an empty string, which Magento validates against the very same `is_required` (`Magento\Customer\Model\Address\Validator\General::checkOptionalFields`).
+
+This is a deliberate behavior change. Where a customer who bypassed the client-side validation previously got a successful order carrying a fake phone number, a shop that requires a telephone now gets a proper `"telephone" is required. Enter and try again.` validation error. Addresses that still carry the old placeholder are cleared when they are loaded into a form, so the customer fills in a real number instead of being shown zeroes.
+
+`attributesForm` only exists since Magento 2.4.7, so all of this is version-gated in `stripLegacyPlaceholderTelephone()` / `applyLegacyPlaceholderTelephone()` (`@graphcommerce/magento-customer`): below 2.4.7 the placeholder is still submitted and no longer stripped, exactly as before.
+
+Pages that render these forms should preload the metadata in `getStaticProps` with `await preloadAttributesForm(client, 'customer_address_edit')`, the same way the account pages already preload `customer_account_create` / `customer_account_edit`. The examples do this for the checkout and address pages, which also closes the window where a customer could submit before the metadata resolved.
diff --git a/examples/magento-graphcms/pages/account/addresses/edit.tsx b/examples/magento-graphcms/pages/account/addresses/edit.tsx
index 7f2fc6ed1e2..f362cbdfd83 100644
--- a/examples/magento-graphcms/pages/account/addresses/edit.tsx
+++ b/examples/magento-graphcms/pages/account/addresses/edit.tsx
@@ -6,7 +6,8 @@ import {
   AccountDashboardAddressesDocument,
   getCustomerAccountIsDisabled,
 } from '@graphcommerce/magento-customer'
-import { PageMeta, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { PageMeta, preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import {
   GetStaticProps,
   iconAddresses,
@@ -82,6 +83,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
   const up = { href: '/account/addresses', title: t`Addresses` }
   const conf = client.query({ query: StoreConfigDocument })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       apolloState: await conf.then(() => client.cache.extract()),
diff --git a/examples/magento-graphcms/pages/checkout/customer/addresses/edit.tsx b/examples/magento-graphcms/pages/checkout/customer/addresses/edit.tsx
index ae2f2685d61..2354be8bb62 100644
--- a/examples/magento-graphcms/pages/checkout/customer/addresses/edit.tsx
+++ b/examples/magento-graphcms/pages/checkout/customer/addresses/edit.tsx
@@ -7,7 +7,8 @@ import {
   AccountDashboardAddressesDocument,
   getCustomerAccountIsDisabled,
 } from '@graphcommerce/magento-customer'
-import { PageMeta, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { PageMeta, preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import {
   GetStaticProps,
   iconAddresses,
@@ -98,6 +99,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
   const up = { href: '/checkout', title: t`Shipping` }
   const conf = client.query({ query: StoreConfigDocument })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       apolloState: await conf.then(() => client.cache.extract()),
diff --git a/examples/magento-graphcms/pages/checkout/edit/billing-address.tsx b/examples/magento-graphcms/pages/checkout/edit/billing-address.tsx
index 98b53e7c3b8..95642cd5e2c 100644
--- a/examples/magento-graphcms/pages/checkout/edit/billing-address.tsx
+++ b/examples/magento-graphcms/pages/checkout/edit/billing-address.tsx
@@ -1,7 +1,8 @@
 import { PageOptions } from '@graphcommerce/framer-next-pages'
 import { cacheFirst } from '@graphcommerce/graphql'
 import { getCheckoutIsDisabled, EditBillingAddressForm } from '@graphcommerce/magento-cart'
-import { StoreConfigDocument } from '@graphcommerce/magento-store'
+import { preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import { GetStaticProps, PageMeta, LayoutOverlayHeader, LayoutTitle } from '@graphcommerce/next-ui'
 import { t } from '@lingui/core/macro'
 import { Trans } from '@lingui/react/macro'
@@ -61,6 +62,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
     fetchPolicy: cacheFirst(staticClient),
   })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       ...(await layout).data,
diff --git a/examples/magento-graphcms/pages/checkout/index.tsx b/examples/magento-graphcms/pages/checkout/index.tsx
index b8fcc5169c8..03fe1bdbdf7 100644
--- a/examples/magento-graphcms/pages/checkout/index.tsx
+++ b/examples/magento-graphcms/pages/checkout/index.tsx
@@ -22,7 +22,8 @@ import {
 } from '@graphcommerce/magento-cart-shipping-address'
 import { ShippingMethodForm } from '@graphcommerce/magento-cart-shipping-method'
 import { CustomerDocument, useCustomerQuery } from '@graphcommerce/magento-customer'
-import { PageMeta, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { PageMeta, preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import {
   FormActions,
   GetStaticProps,
@@ -163,6 +164,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
     fetchPolicy: cacheFirst(staticClient),
   })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       ...(await layout).data,
diff --git a/examples/magento-open-source/pages/account/addresses/edit.tsx b/examples/magento-open-source/pages/account/addresses/edit.tsx
index 24fc985781d..a7f159a3973 100644
--- a/examples/magento-open-source/pages/account/addresses/edit.tsx
+++ b/examples/magento-open-source/pages/account/addresses/edit.tsx
@@ -6,7 +6,8 @@ import {
   useCustomerQuery,
   WaitForCustomer,
 } from '@graphcommerce/magento-customer'
-import { PageMeta, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { PageMeta, preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import type { GetStaticProps } from '@graphcommerce/next-ui'
 import {
   iconAddresses,
@@ -83,6 +84,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
   const up = { href: '/account/addresses', title: t`Addresses` }
   const conf = client.query({ query: StoreConfigDocument })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       apolloState: await conf.then(() => client.cache.extract()),
diff --git a/examples/magento-open-source/pages/checkout/customer/addresses/edit.tsx b/examples/magento-open-source/pages/checkout/customer/addresses/edit.tsx
index b5fd0e8e79f..07905276437 100644
--- a/examples/magento-open-source/pages/checkout/customer/addresses/edit.tsx
+++ b/examples/magento-open-source/pages/checkout/customer/addresses/edit.tsx
@@ -7,7 +7,8 @@ import {
   getCustomerAccountIsDisabled,
   useCustomerQuery,
 } from '@graphcommerce/magento-customer'
-import { PageMeta, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { PageMeta, preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import type { GetStaticProps } from '@graphcommerce/next-ui'
 import {
   FullPageMessage,
@@ -99,6 +100,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
   const up = { href: '/checkout', title: t`Shipping` }
   const conf = client.query({ query: StoreConfigDocument })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       apolloState: await conf.then(() => client.cache.extract()),
diff --git a/examples/magento-open-source/pages/checkout/edit/billing-address.tsx b/examples/magento-open-source/pages/checkout/edit/billing-address.tsx
index 507b268e37e..c319ec3e435 100644
--- a/examples/magento-open-source/pages/checkout/edit/billing-address.tsx
+++ b/examples/magento-open-source/pages/checkout/edit/billing-address.tsx
@@ -2,7 +2,8 @@ import type { PageOptions } from '@graphcommerce/framer-next-pages'
 import { cacheFirst } from '@graphcommerce/graphql'
 import { EditBillingAddressForm, getCheckoutIsDisabled } from '@graphcommerce/magento-cart'
 import { getBillingAddressPermission } from '@graphcommerce/magento-customer'
-import { StoreConfigDocument } from '@graphcommerce/magento-store'
+import { preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import type { GetStaticProps } from '@graphcommerce/next-ui'
 import { LayoutOverlayHeader, LayoutTitle, PageMeta } from '@graphcommerce/next-ui'
 import { t } from '@lingui/core/macro'
@@ -63,6 +64,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
     fetchPolicy: cacheFirst(staticClient),
   })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       ...(await layout).data,
diff --git a/examples/magento-open-source/pages/checkout/index.tsx b/examples/magento-open-source/pages/checkout/index.tsx
index b224f7bde5d..cf566311bd9 100644
--- a/examples/magento-open-source/pages/checkout/index.tsx
+++ b/examples/magento-open-source/pages/checkout/index.tsx
@@ -22,7 +22,8 @@ import {
 } from '@graphcommerce/magento-cart-shipping-address'
 import { ShippingMethodForm } from '@graphcommerce/magento-cart-shipping-method'
 import { CustomerDocument, useCustomerQuery } from '@graphcommerce/magento-customer'
-import { PageMeta, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { PageMeta, preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import type { GetStaticProps } from '@graphcommerce/next-ui'
 import {
   FormActions,
@@ -164,6 +165,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
     fetchPolicy: cacheFirst(staticClient),
   })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       ...(await layout).data,
diff --git a/examples/magento-storyblok/pages/account/addresses/edit.tsx b/examples/magento-storyblok/pages/account/addresses/edit.tsx
index 24fc985781d..a7f159a3973 100644
--- a/examples/magento-storyblok/pages/account/addresses/edit.tsx
+++ b/examples/magento-storyblok/pages/account/addresses/edit.tsx
@@ -6,7 +6,8 @@ import {
   useCustomerQuery,
   WaitForCustomer,
 } from '@graphcommerce/magento-customer'
-import { PageMeta, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { PageMeta, preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import type { GetStaticProps } from '@graphcommerce/next-ui'
 import {
   iconAddresses,
@@ -83,6 +84,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
   const up = { href: '/account/addresses', title: t`Addresses` }
   const conf = client.query({ query: StoreConfigDocument })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       apolloState: await conf.then(() => client.cache.extract()),
diff --git a/examples/magento-storyblok/pages/checkout/customer/addresses/edit.tsx b/examples/magento-storyblok/pages/checkout/customer/addresses/edit.tsx
index b5fd0e8e79f..07905276437 100644
--- a/examples/magento-storyblok/pages/checkout/customer/addresses/edit.tsx
+++ b/examples/magento-storyblok/pages/checkout/customer/addresses/edit.tsx
@@ -7,7 +7,8 @@ import {
   getCustomerAccountIsDisabled,
   useCustomerQuery,
 } from '@graphcommerce/magento-customer'
-import { PageMeta, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { PageMeta, preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import type { GetStaticProps } from '@graphcommerce/next-ui'
 import {
   FullPageMessage,
@@ -99,6 +100,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
   const up = { href: '/checkout', title: t`Shipping` }
   const conf = client.query({ query: StoreConfigDocument })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       apolloState: await conf.then(() => client.cache.extract()),
diff --git a/examples/magento-storyblok/pages/checkout/edit/billing-address.tsx b/examples/magento-storyblok/pages/checkout/edit/billing-address.tsx
index 507b268e37e..c319ec3e435 100644
--- a/examples/magento-storyblok/pages/checkout/edit/billing-address.tsx
+++ b/examples/magento-storyblok/pages/checkout/edit/billing-address.tsx
@@ -2,7 +2,8 @@ import type { PageOptions } from '@graphcommerce/framer-next-pages'
 import { cacheFirst } from '@graphcommerce/graphql'
 import { EditBillingAddressForm, getCheckoutIsDisabled } from '@graphcommerce/magento-cart'
 import { getBillingAddressPermission } from '@graphcommerce/magento-customer'
-import { StoreConfigDocument } from '@graphcommerce/magento-store'
+import { preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import type { GetStaticProps } from '@graphcommerce/next-ui'
 import { LayoutOverlayHeader, LayoutTitle, PageMeta } from '@graphcommerce/next-ui'
 import { t } from '@lingui/core/macro'
@@ -63,6 +64,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
     fetchPolicy: cacheFirst(staticClient),
   })
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       ...(await layout).data,
diff --git a/examples/magento-storyblok/pages/checkout/index.tsx b/examples/magento-storyblok/pages/checkout/index.tsx
index 8e6ce6d00a3..a9c4a21621e 100644
--- a/examples/magento-storyblok/pages/checkout/index.tsx
+++ b/examples/magento-storyblok/pages/checkout/index.tsx
@@ -22,7 +22,8 @@ import {
 } from '@graphcommerce/magento-cart-shipping-address'
 import { ShippingMethodForm } from '@graphcommerce/magento-cart-shipping-method'
 import { CustomerDocument, useCustomerQuery } from '@graphcommerce/magento-customer'
-import { PageMeta, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { PageMeta, preloadAttributesForm, StoreConfigDocument } from '@graphcommerce/magento-store'
+import { magentoVersion } from '@graphcommerce/next-config/config'
 import type { GetStaticProps } from '@graphcommerce/next-ui'
 import {
   FormActions,
@@ -166,6 +167,8 @@ export const getStaticProps: GetPageStaticProps = async (context) => {
   })
   const globalConfig = fetchGlobalConfig(context)
 
+  if (magentoVersion >= 247) await preloadAttributesForm(client, 'customer_address_edit')
+
   return {
     props: {
       ...(await layout).data,
diff --git a/packages/magento-cart-shipping-address/components/ShippingAddressForm/ShippingAddressForm.tsx b/packages/magento-cart-shipping-address/components/ShippingAddressForm/ShippingAddressForm.tsx
index 36fa5f11ce8..12bf35ca341 100644
--- a/packages/magento-cart-shipping-address/components/ShippingAddressForm/ShippingAddressForm.tsx
+++ b/packages/magento-cart-shipping-address/components/ShippingAddressForm/ShippingAddressForm.tsx
@@ -16,13 +16,19 @@ import {
 import type { CartAddressFragment } from '@graphcommerce/magento-cart'
 import {
   AddressFields,
+  applyLegacyPlaceholderTelephone,
   CompanyFields,
   CustomerDocument,
   NameFields,
+  stripLegacyPlaceholderTelephone,
   useBillingAddressPermission,
   useCustomerQuery,
 } from '@graphcommerce/magento-customer'
-import { CountryRegionsDocument, StoreConfigDocument } from '@graphcommerce/magento-store'
+import {
+  CountryRegionsDocument,
+  StoreConfigDocument,
+  useAttributesForm,
+} from '@graphcommerce/magento-store'
 import { customerAddressNoteEnable } from '@graphcommerce/next-config/config'
 import { Form, FormRow } from '@graphcommerce/next-ui'
 import { Trans } from '@lingui/react/macro'
@@ -57,6 +63,11 @@ export const ShippingAddressForm = React.memo<ShippingAddressFormProps>((props)
 
   const billingAddressReadonly = useBillingAddressPermission() === 'READONLY'
 
+  // Magento's address attribute metadata tells us whether a telephone is required, as configured by
+  // `customer/address/telephone_show`.
+  const addressAttributes = useAttributesForm({ formCode: 'customer_address_edit' })
+  const telephoneRequired = addressAttributes.find((a) => a.code === 'telephone')?.is_required
+
   const shopCountry = config?.storeConfig?.locale?.split('_')?.[1].toUpperCase()
 
   const shippingAddress = cartQuery?.cart?.shipping_addresses?.[0]
@@ -102,8 +113,7 @@ export const ShippingAddressForm = React.memo<ShippingAddressFormProps>((props)
           // todo(paales): change to something more sustainable
           firstname: currentAddress?.firstname ?? customerQuery?.customer?.firstname ?? '',
           lastname: currentAddress?.lastname ?? customerQuery?.customer?.lastname ?? '',
-          telephone:
-            currentAddress?.telephone !== '000 - 000 0000' ? currentAddress?.telephone : '',
+          telephone: stripLegacyPlaceholderTelephone(currentAddress?.telephone),
           city: currentAddress?.city ?? '',
           company: currentAddress?.company ?? '',
           vatId: currentAddress?.vat_id ?? '',
@@ -130,7 +140,11 @@ export const ShippingAddressForm = React.memo<ShippingAddressFormProps>((props)
 
       return {
         ...variables,
-        telephone: variables.telephone || '000 - 000 0000',
+        // `CartAddressInput.telephone` is non-nullable, so an empty string is sent rather than
+        // nothing. Magento validates it against the same `is_required` we render the field with, so
+        // a shop that requires a telephone returns a proper validation error instead of silently
+        // accepting a fake number.
+        telephone: applyLegacyPlaceholderTelephone(variables.telephone),
         region: regionId ? variables.region : '',
         regionId,
         addition: variables.addition ?? '',
@@ -159,7 +173,7 @@ export const ShippingAddressForm = React.memo<ShippingAddressFormProps>((props)
           control={form.control}
           name='telephone'
           variant='outlined'
-          required={required.telephone}
+          required={required.telephone || telephoneRequired === true}
           showValid
         />
       </FormRow>
diff --git a/packages/magento-cart/components/EditBillingAddressForm/EditBillingAddressForm.tsx b/packages/magento-cart/components/EditBillingAddressForm/EditBillingAddressForm.tsx
index 2a4d5e9ee66..6c90af12688 100644
--- a/packages/magento-cart/components/EditBillingAddressForm/EditBillingAddressForm.tsx
+++ b/packages/magento-cart/components/EditBillingAddressForm/EditBillingAddressForm.tsx
@@ -8,10 +8,12 @@ import {
 import {
   AddressFields,
   ApolloCustomerErrorAlert,
+  applyLegacyPlaceholderTelephone,
   CompanyFields,
   NameFields,
+  stripLegacyPlaceholderTelephone,
 } from '@graphcommerce/magento-customer'
-import { CountryRegionsDocument } from '@graphcommerce/magento-store'
+import { CountryRegionsDocument, useAttributesForm } from '@graphcommerce/magento-store'
 import { Button, Form, FormActions, FormDivider, FormRow } from '@graphcommerce/next-ui'
 import { Trans } from '@lingui/react/macro'
 import type { SxProps, Theme } from '@mui/material'
@@ -28,6 +30,11 @@ export function EditBillingAddressForm(props: EditBillingAddressFormProps) {
 
   const goToCheckout = useHistoryGo({ href: '/checkout/payment' })
 
+  // Magento's address attribute metadata tells us whether a telephone is required, as configured by
+  // `customer/address/telephone_show`.
+  const addressAttributes = useAttributesForm({ formCode: 'customer_address_edit' })
+  const telephoneRequired = addressAttributes.find((a) => a.code === 'telephone')?.is_required
+
   const form = useFormGqlMutationCart(SetBillingAddressDocument, {
     defaultValues: {
       firstname: address?.firstname,
@@ -36,7 +43,7 @@ export function EditBillingAddressForm(props: EditBillingAddressFormProps) {
       city: address?.city,
       countryCode: address?.country.code,
       street: address?.street?.[0] ?? '',
-      telephone: address?.telephone,
+      telephone: stripLegacyPlaceholderTelephone(address?.telephone),
       houseNumber: address?.street?.[1] ?? '',
       addition: address?.street?.[2] ?? '',
       company: address?.company ?? '',
@@ -56,7 +63,9 @@ export function EditBillingAddressForm(props: EditBillingAddressFormProps) {
 
       return {
         ...variables,
-        telephone: variables.telephone || '000 - 000 0000',
+        // See ShippingAddressForm: `CartAddressInput.telephone` is non-nullable, so send an empty
+        // string rather than a fake number and let Magento validate it.
+        telephone: applyLegacyPlaceholderTelephone(variables.telephone),
         regionId,
       }
     },
@@ -77,7 +86,7 @@ export function EditBillingAddressForm(props: EditBillingAddressFormProps) {
         <FormRow>
           <TelephoneElement
             variant='outlined'
-            required={required.telephone}
+            required={required.telephone || telephoneRequired === true}
             control={control}
             name='telephone'
             disabled={formState.isSubmitting}
diff --git a/packages/magento-customer/components/EditAddressForm/EditAddressForm.tsx b/packages/magento-customer/components/EditAddressForm/EditAddressForm.tsx
index 022d5e72506..f8022fcaf21 100644
--- a/packages/magento-customer/components/EditAddressForm/EditAddressForm.tsx
+++ b/packages/magento-customer/components/EditAddressForm/EditAddressForm.tsx
@@ -1,12 +1,13 @@
 import { ApolloErrorSnackbar, TelephoneElement } from '@graphcommerce/ecommerce-ui'
 import { useQuery } from '@graphcommerce/graphql'
-import { CountryRegionsDocument } from '@graphcommerce/magento-store'
+import { CountryRegionsDocument, useAttributesForm } from '@graphcommerce/magento-store'
 import { Button, Form, FormActions, FormRow } from '@graphcommerce/next-ui'
 import { useFormGqlMutation } from '@graphcommerce/react-hook-form'
 import { Trans } from '@lingui/react/macro'
 import type { SxProps, Theme } from '@mui/material'
 import { useRouter } from 'next/router'
 import { useBillingAddressPermission } from '../../hooks'
+import { stripLegacyPlaceholderTelephone } from '../../utils'
 import type { AccountAddressFragment } from '../AccountAddress/AccountAddress.gql'
 import { AddressFields } from '../AddressFields/AddressFields'
 import { CompanyFields } from '../CompanyFields'
@@ -27,6 +28,11 @@ export function EditAddressForm(props: EditAddressFormProps) {
   const router = useRouter()
   const billingAddressReadonly = useBillingAddressPermission() === 'READONLY'
 
+  // Magento's address attribute metadata tells us whether a telephone is required, as configured by
+  // `customer/address/telephone_show`.
+  const addressAttributes = useAttributesForm({ formCode: 'customer_address_edit' })
+  const telephoneRequired = addressAttributes.find((a) => a.code === 'telephone')?.is_required
+
   const form = useFormGqlMutation(
     UpdateCustomerAddressDocument,
     {
@@ -39,7 +45,7 @@ export function EditAddressForm(props: EditAddressFormProps) {
         postcode: address?.postcode,
         city: address?.city,
         countryCode: address?.country_code,
-        telephone: address?.telephone,
+        telephone: stripLegacyPlaceholderTelephone(address?.telephone),
         houseNumber: address?.street?.[1] ?? '',
         addition: address?.street?.[2] ?? '',
         region: address?.region,
@@ -92,7 +98,7 @@ export function EditAddressForm(props: EditAddressFormProps) {
         <FormRow>
           <TelephoneElement
             variant='outlined'
-            required={required.telephone}
+            required={required.telephone || telephoneRequired === true}
             control={control}
             name='telephone'
             disabled={formState.isSubmitting}
diff --git a/packages/magento-customer/utils/index.ts b/packages/magento-customer/utils/index.ts
index c9d83e87bbf..1015f46f7b7 100644
--- a/packages/magento-customer/utils/index.ts
+++ b/packages/magento-customer/utils/index.ts
@@ -1,3 +1,4 @@
 export * from './customerPermissions'
+export * from './legacyPlaceholderTelephone'
 export * from './billingAddressPermission'
 export * from './orderState'
diff --git a/packages/magento-customer/utils/legacyPlaceholderTelephone.ts b/packages/magento-customer/utils/legacyPlaceholderTelephone.ts
new file mode 100644
index 00000000000..00709cc40cd
--- /dev/null
+++ b/packages/magento-customer/utils/legacyPlaceholderTelephone.ts
@@ -0,0 +1,43 @@
+import { magentoVersion } from '@graphcommerce/next-config/config'
+
+/**
+ * `CartAddressInput.telephone` is a non-nullable `String!`, but whether a shop actually requires a
+ * telephone is a store configuration (`customer/address/telephone_show`). GraphCommerce couldn't
+ * read that, so it submitted this placeholder for an empty field — which is how fake phone numbers
+ * ended up on orders.
+ *
+ * Magento only exposes the required-status through `attributesForm`, which was added in 2.4.7. On
+ * older versions the placeholder is still the only way to satisfy the schema, so the behavior below
+ * is version-gated: it stays exactly as it was on < 2.4.7 and is only dropped where the address
+ * attribute metadata can take over.
+ */
+export const legacyPlaceholderTelephone = '000 - 000 0000'
+
+/** Whether the address attribute metadata (`attributesForm`) is available to drive the field. */
+const hasAddressAttributeMetadata = magentoVersion >= 247
+
+/**
+ * Reading direction: an address saved before this behavior changed still carries the placeholder.
+ * Clear it so the customer is asked for a real number instead of being shown zeroes.
+ *
+ * On Magento < 2.4.7 the placeholder is still actively submitted, so the value is left alone.
+ */
+export function stripLegacyPlaceholderTelephone<T extends string | null | undefined>(
+  telephone: T,
+): T | '' {
+  if (!hasAddressAttributeMetadata) return telephone
+  return telephone === legacyPlaceholderTelephone ? '' : telephone
+}
+
+/**
+ * Writing direction: submit an empty string for an empty field and let Magento validate it against
+ * the same `is_required` the form renders with.
+ *
+ * On Magento < 2.4.7 that flag can't be read, so the placeholder is submitted as before — otherwise
+ * a shop that requires a telephone would start rejecting a form that never marked the field
+ * required.
+ */
+export function applyLegacyPlaceholderTelephone(telephone: string | null | undefined): string {
+  if (!hasAddressAttributeMetadata) return telephone || legacyPlaceholderTelephone
+  return telephone || ''
+}