diff --git a/link/src/main/java/com/stripe/android/link/ui/inline/InlineSignupViewModel.kt b/link/src/main/java/com/stripe/android/link/ui/inline/InlineSignupViewModel.kt
index 9c61df239d9..bc0f9bdd5df 100644
--- a/link/src/main/java/com/stripe/android/link/ui/inline/InlineSignupViewModel.kt
+++ b/link/src/main/java/com/stripe/android/link/ui/inline/InlineSignupViewModel.kt
@@ -190,13 +190,11 @@ internal class InlineSignupViewModel @AssistedInject constructor(
 
         return if (email != null && phoneNumber != null && signUpMode != null) {
             val isNameValid = !requiresNameCollection || !name.isNullOrBlank()
-
-            val phone = phoneController.getE164PhoneNumber(phoneNumber)
             val country = phoneController.getCountryCode()
 
             UserInput.SignUp(
                 email = email,
-                phone = phone,
+                phone = phoneNumber,
                 country = country,
                 name = name,
                 consentAction = signUpMode.toConsentAction(
diff --git a/payments-ui-core/src/test/java/com/stripe/android/ui/core/elements/PhoneNumberControllerTest.kt b/payments-ui-core/src/test/java/com/stripe/android/ui/core/elements/PhoneNumberControllerTest.kt
index d5bfac31797..71ab260ff10 100644
--- a/payments-ui-core/src/test/java/com/stripe/android/ui/core/elements/PhoneNumberControllerTest.kt
+++ b/payments-ui-core/src/test/java/com/stripe/android/ui/core/elements/PhoneNumberControllerTest.kt
@@ -167,4 +167,17 @@ internal class PhoneNumberControllerTest {
             assertThat(awaitItem()).isTrue()
         }
     }
+
+    @Test
+    fun `when phone number is entered, form field value should contain prefix`() = runTest {
+        val phoneNumberController = PhoneNumberController.createPhoneNumberController(
+            initiallySelectedCountryCode = "CA",
+        )
+
+        phoneNumberController.onValueChange("(122) 252-5252")
+
+        phoneNumberController.formFieldValue.test {
+            assertThat(awaitItem().value).isEqualTo("+11222525252")
+        }
+    }
 }
diff --git a/paymentsheet/src/androidTest/java/com/stripe/android/paymentsheet/CustomerSheetNetworkRequests.kt b/paymentsheet/src/androidTest/java/com/stripe/android/paymentsheet/CustomerSheetNetworkRequests.kt
index 184750a9ebf..4d3fa249a7d 100644
--- a/paymentsheet/src/androidTest/java/com/stripe/android/paymentsheet/CustomerSheetNetworkRequests.kt
+++ b/paymentsheet/src/androidTest/java/com/stripe/android/paymentsheet/CustomerSheetNetworkRequests.kt
@@ -51,7 +51,7 @@ internal fun billingDetailsParams(): RequestMatcher {
 internal fun fullBillingDetailsParams(): RequestMatcher {
     return RequestMatchers.composite(
         bodyPart(urlEncode("billing_details[name]"), urlEncode(CustomerSheetPage.NAME)),
-        bodyPart(urlEncode("billing_details[phone]"), CustomerSheetPage.PHONE_NUMBER),
+        bodyPart(urlEncode("billing_details[phone]"), urlEncode("+1${CustomerSheetPage.PHONE_NUMBER}")),
         bodyPart(urlEncode("billing_details[email]"), urlEncode(CustomerSheetPage.EMAIL)),
         bodyPart(urlEncode("billing_details[address][line1]"), urlEncode(CustomerSheetPage.ADDRESS_LINE_ONE)),
         bodyPart(urlEncode("billing_details[address][line2]"), urlEncode(CustomerSheetPage.ADDRESS_LINE_TWO)),
diff --git a/paymentsheet/src/main/java/com/stripe/android/paymentsheet/paymentdatacollection/ach/USBankAccountFormViewModel.kt b/paymentsheet/src/main/java/com/stripe/android/paymentsheet/paymentdatacollection/ach/USBankAccountFormViewModel.kt
index b5191cec185..9005ba9e665 100644
--- a/paymentsheet/src/main/java/com/stripe/android/paymentsheet/paymentdatacollection/ach/USBankAccountFormViewModel.kt
+++ b/paymentsheet/src/main/java/com/stripe/android/paymentsheet/paymentdatacollection/ach/USBankAccountFormViewModel.kt
@@ -547,7 +547,7 @@ internal class USBankAccountFormViewModel @Inject internal constructor(
             name = name,
             // The createPaymentDetails endpoint does not accept uppercase characters.
             email = email?.lowercase(),
-            phone = phone?.let { phoneController.getE164PhoneNumber(it) },
+            phone = phone,
             address = address?.let {
                 ElementsSessionContext.BillingDetails.Address(
                     line1 = it.line1,
diff --git a/paymentsheet/src/test/java/com/stripe/android/paymentsheet/paymentdatacollection/ach/USBankAccountFormViewModelTest.kt b/paymentsheet/src/test/java/com/stripe/android/paymentsheet/paymentdatacollection/ach/USBankAccountFormViewModelTest.kt
index 55a033374be..6c26f2b02bf 100644
--- a/paymentsheet/src/test/java/com/stripe/android/paymentsheet/paymentdatacollection/ach/USBankAccountFormViewModelTest.kt
+++ b/paymentsheet/src/test/java/com/stripe/android/paymentsheet/paymentdatacollection/ach/USBankAccountFormViewModelTest.kt
@@ -286,7 +286,7 @@ class USBankAccountFormViewModelTest {
         val input = PaymentSelection.New.USBankAccount.Input(
             name = "Some One",
             email = "someone@email.com",
-            phone = "1112223456",
+            phone = "+11112223456",
             address = Address(
                 line1 = "123 Not Main Street",
                 line2 = "Apt 123",
@@ -331,7 +331,7 @@ class USBankAccountFormViewModelTest {
         val input = PaymentSelection.New.USBankAccount.Input(
             name = "Some One",
             email = "someone@email.com",
-            phone = "1112223456",
+            phone = "+11112223456",
             address = Address(
                 line1 = "123 Not Main Street",
                 line2 = "Apt 123",
@@ -386,7 +386,7 @@ class USBankAccountFormViewModelTest {
                     billingDetails = PaymentSheet.BillingDetails(
                         name = CUSTOMER_NAME,
                         email = CUSTOMER_EMAIL,
-                        phone = CUSTOMER_PHONE_COUNTRY_CODE + CUSTOMER_PHONE,
+                        phone = CUSTOMER_PHONE,
                         address = CUSTOMER_ADDRESS,
                     ),
                     billingDetailsCollectionConfiguration = PaymentSheet.BillingDetailsCollectionConfiguration(
@@ -528,7 +528,7 @@ class USBankAccountFormViewModelTest {
                         billingDetails = PaymentSheet.BillingDetails(
                             name = CUSTOMER_NAME,
                             email = CUSTOMER_EMAIL,
-                            phone = CUSTOMER_PHONE_COUNTRY_CODE + CUSTOMER_PHONE,
+                            phone = CUSTOMER_PHONE,
                             address = CUSTOMER_ADDRESS,
                         ),
                         billingDetailsCollectionConfiguration = PaymentSheet.BillingDetailsCollectionConfiguration(
@@ -1638,8 +1638,7 @@ class USBankAccountFormViewModelTest {
         const val CUSTOMER_EMAIL = "email@email.com"
         const val STRIPE_ACCOUNT_ID = "stripe_account_id"
         const val CUSTOMER_COUNTRY = "US"
-        const val CUSTOMER_PHONE_COUNTRY_CODE = "+1"
-        const val CUSTOMER_PHONE = "3105551234"
+        const val CUSTOMER_PHONE = "+13105551234"
         val CUSTOMER_ADDRESS = PaymentSheet.Address(
             line1 = "123 Main Street",
             line2 = "Apt 456",
diff --git a/stripe-ui-core/src/main/java/com/stripe/android/uicore/elements/PhoneNumberController.kt b/stripe-ui-core/src/main/java/com/stripe/android/uicore/elements/PhoneNumberController.kt
index a378e6f5112..d5ef93061ae 100644
--- a/stripe-ui-core/src/main/java/com/stripe/android/uicore/elements/PhoneNumberController.kt
+++ b/stripe-ui-core/src/main/java/com/stripe/android/uicore/elements/PhoneNumberController.kt
@@ -77,8 +77,8 @@ class PhoneNumberController private constructor(
     override val isComplete = combineAsStateFlow(fieldValue, phoneNumberMinimumLength) { value, minLength ->
         value.length >= (minLength ?: 0) || acceptAnyInput
     }
-    override val formFieldValue = combineAsStateFlow(fieldValue, isComplete) { fieldValue, isComplete ->
-        FormFieldEntry(fieldValue, isComplete)
+    override val formFieldValue = combineAsStateFlow(rawFieldValue, isComplete) { rawFieldValue, isComplete ->
+        FormFieldEntry(rawFieldValue, isComplete)
     }
 
     override val error: StateFlow<FieldError?> = combineAsStateFlow(