Can I put my att iphone 4 on straight talk?

We got off the contract and i still have the phone, can I put it in straight talk

Ofcourse.

Just get your provider to provide you the micro sim card.

If it's not the same provider, you might need to get your phone unlocked. This can cost up to 50$

Yes you can! First the best thing to do is call AT&T and ask them to unlock your phone, which they should do for you since you are not under contract. (If they won't, you can get your phone unlocked on eBay for a few dollars, but it may not even be necessary since its been proven AT&T phones work with straight talk w/o being unlocked.) Go to Straight Talk's website to the Bring Your Own Phone program, and order a micro SIM. You should be aware that while you will definitely save a lot, your picture messaging will not work unless you jailbreak your phone, and straight talk is now more and more limiting your data, to about 1.5 GB per month. If you do switch (it's worth it) you will need to install some settings to get your Internet working properly, if you need help i can walk you thro that, straight talk should explain it to you as well (but their English really sucks).

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