Call Intent Android

public void onClick(View v){
        String namenum="Name: "+txtname.getText().toString();
        namenum=namenum+" Phone:"+txtphone.getText().toString();
        //display the inputs
        Toast.makeText(this, namenum,
                Toast.LENGTH_LONG).show();//dont type context:
        Intent callIntent = new Intent(Intent.ACTION_CALL);
        callIntent.setData(Uri.parse("tel:"+txtphone.getText().toString()));

        if (ActivityCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        startActivity(callIntent);
        //in AndroidManifest.xml add
        //<uses-permission android:name="android.permission.CALL_PHONE" />
    }//end onClick