You forgot to call startActivity. It should look like this:
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + bundle.getString("mobilePhone")));
context.startActivity(intent);
An intent by itself is simply an object that describes something. It doesn’t do anything.
Don’t forget to add the relevant permission to your manifest:
<uses-permission android:name="android.permission.CALL_PHONE" />