How to unlock iPhone 4 on AT&T?

I have an iPhone 4 on the AT&T network. It is jailbroken and I want to unlock it so that I can use it on straighttalk. I'm not the original owner of the phone so I can't go through AT&T to get them to unlock it. How can I unlock the iphone 4 that is running on ios 7.0.4 without paying anything? If I have to pay, where is the cheapest place to go?

Go to their shop

IPhone 4 can't be unlocked after jailbreak like older iPhones like 3g/3gs, so can't unlock it for free trough a software method. To get it unlocked trough at&t do not think you need to be the original owner, but to have an account with them, can find more details here or call them:
https://www.att.com/...dCondition
You can find a lot of websites that unlock at&t iphones, but many may be scams, since I work in the field can tell you are 2 unlocks working now for at&t network iPhone:
-a cheaper one between 45-60$ for iPhones not blacklisted and out of contract
-a more expensive but faster one that is between 120-135$
Another method that might help you, and it may be cheaper is with a gevey sim, can get it from ebay for example for 5-20$, but have to verify first if your modem firmware is supported. If need any other info let me know

  • Which unlock sim card can unlock Sprint iPhone 5c? I heard about the R-SIM 9 Pro I want it to unlock this iPhone 5c http://vod.ebay.com/vod/FetchOrderDetails?ViewPaymentStatus&transid=1391699344012&itemId=221458935071&ssPageName=STRK:MESO:VPS
  • Unlock iPhone 5S AT&T with an unlock code? Recently I bought an iPhone 5s 64gb from AT&T from eBay. The seller gave me the unlock code that he was given by the AT&T wireless department. Now, my question is, how can I unlock this phone to use it with my T-Mobile SIM card? Having the unlock code I still must give 160 bucks to an unlocker website to do it for me? Should I contact the AT&T service or what?
  • Unlock iPhone 4S AT&T baseband 3.0.04 on 6.0.1 with IMEI Unlock? I have iPhone 4S with modem firmware / baseband 3.0.04 running iOS 6.0.1 locked to AT&T, how could I make factory unlock to it?
  • Unlock iPhone 4 difficulty getting an unlock code? I need to get my iPhone unlocked to use with an Australian sim card. I have called Vodafone in Ireland to get this done but they have just tried to call me back and i do not have enough credit on my Irish number to receive the call as i'm in Australia at the moment. I can't perform the unlock procedure through Vodafone online either.