I want to get a prepaid plan for my iPhone 4S

So I bought an AT&T micro sim off amazon and I need an IMEI# from any prepaid phone. Can it be from a Net10 phone or tracfone or does it have to be an AT&T phone even though it's not in service? One guy said to put all zeroes for the IMEI#?

No, you need the IMEI# from your iphone to unlock your iphone, then you get the microsim from the company you are buying the minutes from. Of course, if your iphone is no longer in service, good luck trying to get the unlock code from AT&T, you'll have to use a third party unlock service to provide the code.