Fixed empty phone number

For getting phone number from UICC, when getLine1Number is not available,
fallback to phone number stored in subscription info.

Fix: 302437869
Flag: uicc_phone_number_fix
Test: atest SubscriptionManagerServiceTest
Test: Basic telephony functionality tests
Change-Id: I0e5a9db89fbe94e4f08928da2cb98230c3655128
diff --git a/flags/subscription.aconfig b/flags/subscription.aconfig
index 9a5dabc..dc17a61 100644
--- a/flags/subscription.aconfig
+++ b/flags/subscription.aconfig
@@ -77,3 +77,15 @@
     purpose: PURPOSE_BUGFIX
   }
 }
+
+# OWNER=jackyu TARGET=24Q4
+flag {
+  name: "uicc_phone_number_fix"
+  namespace: "telephony"
+  description: "Fixed that empty phone number when getLine1Number returns empty"
+  bug: "302437869"
+
+  metadata {
+    purpose: PURPOSE_BUGFIX
+  }
+}