If you buy a iphone 5 on craigslist how to you put your sim in it?

If i buy a phone on craigslist will i be able to call at&t and get them to transfer my phone line to it or how does that work? I have a sim card now

If you already have a Nano SIM, here's instructions for inserting it: http://support.apple.com/.../kb/HT5163
Otherwise, you will have to go to AT&T and have them give you a new SIM, which they'll probably install for you.

I don't know. I have no expensive phone