Added more permission check.

android/src/main/java/com/learnium/RNDeviceInfo/RNDeviceModule.java

@@ -86,7 +86,6 @@ public class RNDeviceModule extends ReactContextBaseJavaModule {
   public @Nullable Map<String, Object> getConstants() {
     HashMap<String, Object> constants = new HashMap<String, Object>();
 
-    TelephonyManager telMgr = (TelephonyManager) this.reactContext.getSystemService(Context.TELEPHONY_SERVICE);
     PackageManager packageManager = this.reactContext.getPackageManager();
     String packageName = this.reactContext.getPackageName();
 
@@ -133,7 +132,10 @@ public class RNDeviceModule extends ReactContextBaseJavaModule {
     constants.put("timezone", TimeZone.getDefault().getID());
     constants.put("isEmulator", this.isEmulator());
     constants.put("isTablet", this.isTablet());
-    if (getCurrentActivity().checkCallingOrSelfPermission(Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED) {
+    if (getCurrentActivity().checkCallingOrSelfPermission(Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED ||
+            getCurrentActivity().checkCallingOrSelfPermission(Manifest.permission.READ_SMS) == PackageManager.PERMISSION_GRANTED ||
+            getCurrentActivity().checkCallingOrSelfPermission("android.permission.READ_PHONE_NUMBERS") == PackageManager.PERMISSION_GRANTED) {
+        TelephonyManager telMgr = (TelephonyManager) this.reactContext.getSystemService(Context.TELEPHONY_SERVICE);
         constants.put("phoneNumber", telMgr.getLine1Number());
     }
     return constants;