Iphone 4 from att moving to straight talk?

I'm buying a used iphone 4 from someone i know. The iphone is with att and the owner doesn't know if it's unlocked. I was to move the iphone to straight talk on att. I'm currently with straight talk and i want to keep my number. Can you give me steps on how to do this transfer. I've never.worked a iphone before. Please give advice also please.

Does your phone currently have a SIM card. If not buy a sim (AT&T Straightalk sim) and ask to transfer your account to that sim. If your SIM card is micro then place it in iphone. If it's not micro then cut to make it fit the iphone sim tray.
You'll need Wi-Fi to activate phone.
Luck with your new iphone

If you're not sure if the phone is unlocked, get it checked and unlock it if necessary. Once done, put your StraightTalk SIM in the iPhone and activate it. If your SIM is normal or mini-SIM, trim it to micro-SIM. If you need any help with unlocking, mail me for references.

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