Bring your Unlocked GSM or AT&T device in and or purchase one and save. Cellular Etc will be happy to port in your number or get you started with a new phone number.
H2O wireless works on any AT&T phone:
$20 unlimited talk, text 2GB
$50 24GB high speed, unlimited after that slower speed
$10 by the minute = lasts for 3 months
$100 by the minute = 2000 minutes per year