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I would like to implement an application for block a mobile number for receiving or sending calls and messages. In my application I am entering mobile number at EditText box then I am clicking a button for block the mobile number which has entered by the user. I have implemented an activity class as follows: public class BlockNumberActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ((Button)findViewById(R.id.block)).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String mobileNumer = ((EditText)findViewById(R.id.mobileNum)).getText().toString(); //How to block entered mobileNumber } }); ((Button)findViewById(R.id.unblock)).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String mobileNumer = ((EditText)findViewById(R.id.mobileNum)).getText().toString(); //How to unblock entered mobileNumber } }); } } I think we may use BroadcastReceiver . But I don't have more knowledge on it. Please give me an idea how to implement blocking or unblocking mobile number. Please any body help me.....

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