Use TelephonyManager api to get SPN of sim to display in UI.

Bug: 19476304
Change-Id: Ia16465584cf31858bbf1ae36cfdbf21184de10d7

src/com/android/settings/sim/SimSettings.java

@@ -365,8 +365,14 @@ public class SimSettings extends RestrictedSettingsFragment implements Indexable
                 numberView.setText(PhoneNumberUtils.formatNumber(rawNumber));
             }
 
+            final TelephonyManager tm =
+                        (TelephonyManager) getActivity().getSystemService(
+                        Context.TELEPHONY_SERVICE);
+            String simCarrierName = tm.getSimOperatorNameForSubscription(mSubInfoRecord
+                        .getSubscriptionId());
             TextView carrierView = (TextView)dialogLayout.findViewById(R.id.carrier);
-            carrierView.setText(mSubInfoRecord.getCarrierName());
+            carrierView.setText(!TextUtils.isEmpty(simCarrierName) ? simCarrierName :
+                    getContext().getString(com.android.internal.R.string.unknownName));
 
             builder.setTitle(String.format(res.getString(R.string.sim_editor_title),
                     (mSubInfoRecord.getSimSlotIndex() + 1)));