Cytown is 100% correct. I got HTC Tattoo with 1.6 and can confirm that it works.
My code is:
public void onClick(View v) {
SmsManager sms = SmsManager.getDefault();
ArrayList<String> smstext = sms.divideMessage("asdfasdf");
sms.sendMultipartTextMessage("5556", null, smstext, null, null);
}
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