![]() ![]() ![]() An AT&T SIM (Subscriber Identity Module) card is a small plastic chip used to store various pieces of data in a cell phone, such as billing information. Nov 03, 2017 How to Activate a Cell Phone. You can most likely use your old SIM card unless it. How do I find the phone's sim card number in order to activate a 3G. I bought a T-mo iphone SE from the Apple Store on Monday. They were out of SIM Free models so the apple guy gave me that option. 'Device Only' option he referred to it as. I assume same with AT&T? I just had to take out the T-mo SIM and use my own SIM (AT&T), and ignore the T-mobile activation message. In any case, to the OP. I'd use an old SIM. I think if you activate a new one, it might lock the phone to that carrier. With an old SIM, it would be unlocked. At least I think so. That's how it worked for me. Any of the newer at&t phones will work with your old SIM. The important thing is that if you purchase a new GoPhone, be sure you activate the new phone with the old SIM in it. If you put the SIM that comes with the new phone in the phone for activation, that SIM and phone will then be 'locked' to one another for a period of time and you would have to contact at&t customer service to resolve the issue. You wouldn't have that concern if you purchase a device being sold for post paid service with the no-commitment pricing; but that route is far more expensive, and especially if you are interested in any of the prepaid refurbs. I recently purchased a prepaid refurb SE W518a and have had no issue using it with either of my older SIMs - by not using the SIM that came with the new phone at all. Instead I've just kept it on hand so that I'll have an unactivated SIM card in the future should I ever need one for some reason. Mark8538 wrote: Thanks for your reply. Just wanted a clarification. Will any At&t phone work or does it have to be a 'go phone'? I stumbled across another post that said the Iphone wont accept and old sim card.
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