[log] debug getDataNetworkType

Fix: 400506639
Test: basic voice call
Flag: EXEMPT log only
Change-Id: I6a485b51064bf6307dafb853492c9484925ca0a0
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 0548aa5..5a080aa 100644
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -5828,6 +5828,7 @@
                 mApp, functionName)) {
             if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                     mApp, subId, callingPackage, callingFeatureId, functionName)) {
+                loge("getDataNetworkTypeForSubscriber: missing permission " + callingPackage);
                 return TelephonyManager.NETWORK_TYPE_UNKNOWN;
             }
         }
@@ -5841,6 +5842,7 @@
             if (phone != null) {
                 return phone.getServiceState().getDataNetworkType();
             } else {
+                loge("getDataNetworkTypeForSubscriber: phone is null for sub " + subId);
                 return TelephonyManager.NETWORK_TYPE_UNKNOWN;
             }
         } finally {