diff --git a/app/src/main/java/org/thoughtcrime/securesms/registration/v2/AppRegistrationStorageController.kt b/app/src/main/java/org/thoughtcrime/securesms/registration/v2/AppRegistrationStorageController.kt
index ff52264188..d201956ed7 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/registration/v2/AppRegistrationStorageController.kt
+++ b/app/src/main/java/org/thoughtcrime/securesms/registration/v2/AppRegistrationStorageController.kt
@@ -755,7 +755,8 @@ class AppRegistrationStorageController(private val context: Context) : StorageCo
     val isAciChanged = SignalStore.account.aci != aci
 
     if (pni == null) {
-      Log.i(TAG, "[applyAccountData] No PNI in the account data. Registering an account with no phone number.")
+      Log.i(TAG, "[applyAccountData] No PNI in the account data. Registering an account with no phone number. Clearing any E164/PNI state from a previous registration.")
+      SignalStore.account.clearE164AndPni()
     }
 
     SignalStore.account.setAci(aci)
diff --git a/app/src/test/java/org/thoughtcrime/securesms/registration/v2/AppRegistrationStorageControllerTest.kt b/app/src/test/java/org/thoughtcrime/securesms/registration/v2/AppRegistrationStorageControllerTest.kt
index cd7a4c096c..70ab495b3e 100644
--- a/app/src/test/java/org/thoughtcrime/securesms/registration/v2/AppRegistrationStorageControllerTest.kt
+++ b/app/src/test/java/org/thoughtcrime/securesms/registration/v2/AppRegistrationStorageControllerTest.kt
@@ -260,6 +260,42 @@ class AppRegistrationStorageControllerTest {
     assertThat(readInProgressData().accountDataCommitted).isTrue()
   }
 
+  @Test
+  fun `commit - numberless re-registration over existing account - clears stale pni and e164`() = runBlocking<Unit> {
+    SignalStore.account.setAci(aci)
+    SignalStore.account.setPni(pni)
+    SignalStore.account.setE164(E164)
+    SignalStore.account.restoreAciIdentityKeyFromBackup(aciIdentity.publicKey.serialize(), aciIdentity.privateKey.serialize())
+    SignalStore.account.restorePniIdentityKeyFromBackup(pniIdentity.publicKey.serialize(), pniIdentity.privateKey.serialize())
+    SignalStore.account.pniPreKeys.isSignedPreKeyRegistered = true
+    SignalStore.account.pniPreKeys.activeSignedPreKeyId = 12
+    SignalStore.account.setRegistered(true)
+
+    seedInProgressData(
+      RegistrationData(
+        accountData = accountData(reRegistration = true).newBuilder()
+          .e164("")
+          .pni("")
+          .pniIdentityKeyPair(ByteString.EMPTY)
+          .pniSignedPreKey(ByteString.EMPTY)
+          .pniLastResortKyberPreKey(ByteString.EMPTY)
+          .pniRegistrationId(0)
+          .build(),
+        accountEntropyPool = aep.value
+      )
+    )
+
+    controller.commitRegistrationData()
+
+    assertThat(SignalStore.account.aci).isEqualTo(aci)
+    assertThat(SignalStore.account.pni).isNull()
+    assertThat(SignalStore.account.e164).isNull()
+    assertThat(SignalStore.account.hasPniIdentityKey()).isFalse()
+    assertThat(SignalStore.account.pniPreKeys.isSignedPreKeyRegistered).isFalse()
+    assertThat(SignalStore.account.aciPreKeys.isSignedPreKeyRegistered).isTrue()
+    assertThat(SignalStore.account.isRegistered).isTrue()
+  }
+
   @Test
   fun `commit - pin opted out - applies svr opt out`() = runBlocking<Unit> {
     seedInProgressData(
diff --git a/feature/registration/src/test/java/org/signal/registration/RegistrationEndToEndTest.kt b/feature/registration/src/test/java/org/signal/registration/RegistrationEndToEndTest.kt
index 894f34f117..dedc060688 100644
--- a/feature/registration/src/test/java/org/signal/registration/RegistrationEndToEndTest.kt
+++ b/feature/registration/src/test/java/org/signal/registration/RegistrationEndToEndTest.kt
@@ -1659,6 +1659,48 @@ class RegistrationEndToEndTest {
     assert(purchaseApi.consumedTokens == listOf(FakeOneTimePurchaseApi.PURCHASE_TOKEN)) { "Expected the purchase to be consumed once but was ${purchaseApi.consumedTokens}" }
   }
 
+  @Test
+  fun `registering without a phone number on a device already registered with one commits account data carrying no pni`() {
+    enableSignalLoginRegistration()
+    storageController.preExistingRegistrationData = preExistingRegistrationData(E164)
+
+    var registrationComplete = false
+    launchRegistrationFlow(onRegistrationComplete = { registrationComplete = true })
+
+    startSignalLoginRegistration()
+    buySignalLogin()
+
+    waitForTag(TestTags.SIGNAL_LOGIN_INFO_SCREEN)
+    val login = registeredSignalLogin()
+
+    recordSignalLoginManually()
+    enterSignalLogin(login)
+    skipUsername()
+
+    waitFor("registration to complete") { registrationComplete }
+
+    val committed = storageController.committedData
+    assert(committed != null) { "Expected registration data to be committed" }
+
+    val accountData = committed!!.accountData
+    assert(accountData != null) { "Expected account data to be committed" }
+    assert(accountData!!.aci == login.aci.toString()) { "Expected committed ACI ${login.aci} but was ${accountData.aci}" }
+
+    // The device still holds the previous account's E164 and PNI. None of it may leak into the committed data, which is
+    // what the app applies to permanent storage -- a PNI here with no matching key material is unusable.
+    assert(accountData.e164 == null) { "Expected no committed e164 but was ${accountData.e164}" }
+    assert(accountData.pni == null) { "Expected no committed PNI but was ${accountData.pni}" }
+    assert(accountData.pniIdentityKeyPair.size == 0) { "Expected no committed PNI identity key but was ${accountData.pniIdentityKeyPair.size} bytes" }
+    assert(accountData.pniSignedPreKey.size == 0) { "Expected no committed PNI signed pre-key but was ${accountData.pniSignedPreKey.size} bytes" }
+    assert(accountData.pniLastResortKyberPreKey.size == 0) { "Expected no committed PNI last-resort kyber pre-key but was ${accountData.pniLastResortKyberPreKey.size} bytes" }
+    assert(accountData.pniRegistrationId == 0) { "Expected no committed PNI registration id but was ${accountData.pniRegistrationId}" }
+
+    val request = networkController.lastRegisterAccountRequest
+    assert(request != null) { "Expected a registration attempt" }
+    assert(request!!.e164 == null) { "Expected the previous number to be left behind but was ${request.e164}" }
+    assert(request.pniPreKeys == null) { "An account with no phone number has no PNI, so no PNI key material should be sent" }
+  }
+
   @Test
   fun `a purchased signal login that the password manager takes and hands back moves the user on to the username step`() {
     enableSignalLoginRegistration()