Can I use my iPhone 4 with Straight Talk if it currently has a plan with AT&T?

I'm currently on an ex's family phone plan and they stopped paying their bill. I'd like to start using Straight Talk but I'm not sure if it'll work since my phones on a contract. It's been shut off but I was wondering if I could unlock it and then buy one of those SIM cards from Walmart?

I think the phone will be black listed until the balance is paid off with ATT, but not positive. However, you need to check the Imei number of the phone. Put "Imei check" in Google and you'll have many options to check if the Imei number on the phone is good or not. I don't know where the Imei on an iPhone is located, you'll need to Google to check that out. Good luck.

You can also go to howardforums.com and browse the Straight Talk form or join and ask questions.

You need a att compatable/straight talk sim.
walmart only sells tmobile ones.
you can buy a att compatable one on ebay for $30 or so.
or you can unlock your iphone so it can use the walmart tmobile ones.
i can unlock it for $20, i also have new unlocked iphones for sale or trade.email me

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