following code is not working for Jelly Bean (Android 4.1):
final ComponentName cn = new ComponentName(\"com.android.phone\",\"com.android.phone.Settings\");
fin
try as:
final Intent intent=new Intent(Settings.ACTION_DATA_ROAMING_SETTINGS);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
final ComponentName cn = new ComponentName("com.android.phone","com.android.phone.Settings");
intent.setComponent(cn);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);