I've implemented code to send sms message from an Android emulator to another, which works well. But when I try to send message from the emulator or an Android device(with wifi only, no data plan or number with the phone) to a device(iPhone ), it doesn't work. I'm not quite sure if sms needs a data plan to send message in real world. Thx for the help!
SmsManager sms = SmsManager.getDefault();
sms.sendTextMessage(number, null, message, null, null);
Though sms does not require a data plan, it needs a working GSM or CDMA Network connection with call working.