Can you put an iphone on a straight talk plan?

My friend is going to sell me their iphone 4 and I already have a straight talk plan. I was wondering if it is compatible with this plan. They sell iphones for straight talk but this one is cheaper. I wanted to make sure before I bought it.

What carrier is the Iphone coming from? If its the regular iphone 4 on Sprint or Verizon then you can't do it because that iphone 4 on those carriers is CDMA only and there's no sim card slot on the regular. If it is coming from T-mobile or AT&T then you will just have to unlock it using a Gevey sim. I have a link to it in my source

If it's a At&t or unlocked iPhone 4 then it will work. Straight talk run off At&t tower so it will work with any AT&t phone.

No problem.

You will need to buy a micro sim from your carrier ($25ish dollars) and it'll work just fine.

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