How to check user entered own phone number in EditText?

Question

Mobile number will be entered in an edittext by user on registration page in my Android application. How can I check that user entered his/her mobile number not other's ?

I've tried this :

TelephonyManager tMgr =(TelephonyManager)mAppContext.getSystemService(Context.TELEPHONY_SERVICE);
  mPhoneNumber = tMgr.getLine1Number();

And compare this variable with edittext's text. But mPhoneNumber returns NULL in my case. Is there any other options? How to solve this ?

Any help would be appreciable.

I have tried this : Check source code :

     public class MainActivity extends Activity{    

    Button submit;
    EditText contact;
    String phNo;
    ProgressDialog progress;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        contact = (EditText)findViewById(R.id.mobileNumber);
        submit = (Button) findViewById(R.id.button1);

        submit.setOnClickListener(new OnClickListener()
        {
                public void onClick(View v)
                {
                    phNo = contact.getText().toString();
                    new CheckOwnMobileNumber().execute();
                    Toast.makeText(getApplicationContext(), phNo, Toast.LENGTH_LONG).show();
                }
        });



    }

    private class CheckOwnMobileNumber extends AsyncTask<String, Void, String>
    {
        @Override
        protected void onPostExecute(String result)
        {
            // TODO Auto-generated method stub
            if(progress.isShowing())
            {
                progress.dismiss();
                // Check SMS Received or not after that open dialog date
                /*if(SMSReceiver.str.equals(phNo))
                {
                    Toast.makeText(getApplicationContext(), "Thanks for providing your number.", Toast.LENGTH_LONG).show();
                }
                else
                {
                    Toast.makeText(getApplicationContext(), "Provide your own mobile number please.", Toast.LENGTH_LONG).show();
                    return;
                }*/

            }
        }

        @Override
        protected String doInBackground(String... params)
        {
            // TODO Auto-generated method stub
            String msg = phNo;
            try
            {
                sendSMS(phNo, msg);
            }
            catch(Exception ex)
            {
                Log.v("Exception :", ""+ex);
            }
            return null;
        }

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            progress = ProgressDialog.show(MainActivity.this, "","Checking Mobile Number...");
            progress.setIndeterminate(true);
            progress.getWindow().setLayout(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
            super.onPreExecute();
        }

}

    private void sendSMS(String phoneNumber, String message)
        {        
            //PendingIntent pi = PendingIntent.getActivity(getApplicationContext(), 0, new Intent(getApplicationContext(), MainActivity.class), 0);                
            SmsManager sms = SmsManager.getDefault();
            sms.sendTextMessage(phoneNumber, null, message, null, null);        
        }
}

Receiver to listen SMS received or not ?

public class SMSReceiver extends BroadcastReceiver
{
private static final String ACTION_SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";
Context mContext;
private Intent mIntent;
static String address, str = null;

// Retrieve SMS
public void onReceive(Context context, Intent intent) {
    mContext = context;
    mIntent = intent;

    String action = intent.getAction();

    if(action.equals(ACTION_SMS_RECEIVED))
    {
        SmsMessage[] msgs = getMessagesFromIntent(mIntent);
        if (msgs != null)
        {
            for (int i = 0; i < msgs.length; i++)
            {
                address = msgs[i].getOriginatingAddress();
                str = msgs[i].getMessageBody().toString();
            }
        }   

        // ---send a broadcast intent to update the SMS received in the
        // activity---
        Intent broadcastIntent = new Intent();
        broadcastIntent.setAction("SMS_RECEIVED_ACTION");
        broadcastIntent.putExtra("sms", str);
        context.sendBroadcast(broadcastIntent);
    }

}

public static SmsMessage[] getMessagesFromIntent(Intent intent)
{
    Object[] messages = (Object[]) intent.getSerializableExtra("pdus");
    byte[][] pduObjs = new byte[messages.length][];

    for (int i = 0; i < messages.length; i++)
    {
        pduObjs[i] = (byte[]) messages[i];
    }

    byte[][] pdus = new byte[pduObjs.length][];
    int pduCount = pdus.length;
    SmsMessage[] msgs = new SmsMessage[pduCount];
    for (int i = 0; i < pduCount; i++)
    {
        pdus[i] = pduObjs[i];
        msgs[i] = SmsMessage.createFromPdu(pdus[i]);
    }
    return msgs;
}
}

LOGCAT :

03-13 17:31:02.049: E/ActivityManager(161): ANR in com.example.test
03-13 17:31:02.049: E/ActivityManager(161): Reason: Broadcast of Intent { act=android.provider.Telephony.SMS_RECEIVED cmp=com.example.test/.SMSReceiver (has extras) }
03-13 17:31:02.049: E/ActivityManager(161):   54% 3732/com.example.test: 54% user + 0% kernel / faults: 21 minor
03-13 17:31:02.049: E/ActivityManager(161):   40% 3732/com.example.test: 40% user + 0% kernel / faults: 2 minor
03-13 17:31:30.699: I/ActivityManager(161): Killing com.example.test (pid=3732): user's request
03-13 17:31:30.799: I/ActivityManager(161): Process com.example.test (pid 3732) has died.
03-13 17:31:30.799: I/WindowManager(161): WIN DEATH: Window{40992f50 com.example.test/com.example.test.MainActivity paused=false}
03-13 17:31:30.819: E/InputDispatcher(161): channel '40818670 com.example.test/com.example.test.MainActivity (server)' ~ Consumer closed input channel or an error occurred.  events=0x8
03-13 17:31:30.819: E/InputDispatcher(161): channel '40818670 com.example.test/com.example.test.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
03-13 17:34:59.649: I/ActivityManager(161): Start proc com.example.test for broadcast com.example.test/.SMSReceiver: pid=4037 uid=10098 gids={}

Answer 1

Its not guaranteed that tMgr.getLine1Number(); will always return your SIM card's number. Because it depends on the availability of number in SIM card. Like in my case, my Tre-Sweden SIM card doesn't contain my phone number.

But if you put the SIM card into an old SonyEricsson or Nokia phone, then you would get an option to edit this number (on SIM). Once its done, the android device will recognize the number and will show you.

Besides, if you do get your phone number through the code, then the best way to compare two numbers is:

boolean isSame = PhoneNumberUtils.compare(num1, num2);

---

Alternatively, you may implement some sort of pin-code verification logic (like Viber, WhatsApp or other application does) in which you ask the user to enter their phone number during registration. Later, that phone number is sent to the server and a pin-code is generated against that number which is sent to the user via SMS. Finally, the user has to enter that pin-code (received in SMS) to complete the registration.

Or

Simply send an SMS from user's device (with a consent) to your server/device and get to know their phone number.