Live in USA. Looking to buy bulk of sim cards to text with and verify facebook (don't send me a message offering your services, not interested, I am here for information). I know AT&T you can buy a prepaid plan with texting, and they allow you to change your number as often as you want, but there is no way to go back to a number. I would like a plan to where I can just insert sim card 1, and I will have that phone number to text with on phone, and if i insert sim card 2, I will have that phone number to text with. I am looking for plug-n-play. With AT&T, you can to walk in store to change, but there is no way to go back to an old number. Any ideas on how to do this?