diff --git a/src/com/android/settings/deviceinfo/Status.java b/src/com/android/settings/deviceinfo/Status.java
index ea3ca97642f..99a8975e07d 100644
--- a/src/com/android/settings/deviceinfo/Status.java
+++ b/src/com/android/settings/deviceinfo/Status.java
@@ -222,7 +222,13 @@ public class Status extends PreferenceActivity {
             }
         }
 
-        setSummaryText("number", PhoneNumberUtils.formatNumber(mPhone.getLine1Number()));
+        String rawNumber = mPhone.getLine1Number();  // may be null or empty
+        String formattedNumber = null;
+        if (!TextUtils.isEmpty(rawNumber)) {
+            formattedNumber = PhoneNumberUtils.formatNumber(rawNumber);
+        }
+        // If formattedNumber is null or empty, it'll display as "Unknown".
+        setSummaryText("number", formattedNumber);
 
         mPhoneStateReceiver = new PhoneStateIntentReceiver(this, mHandler);
         mPhoneStateReceiver.notifySignalStrength(EVENT_SIGNAL_STRENGTH_CHANGED);