Carrier unlock iPhone 4

Hi, I have an AT&T iPhone 4 on ios 6.1.3.It is jailbroken but I can't seem to find any software carrier unlocks? I have no money to get it factory unlocked or to get any hardware unlocks. Is there any software unlocks that work for 6.1.3?

Added (1). Again, I have no money, so don't link me to some site that charges for a download please!

Hi software tools is not safe to unlock your iphone4 because your iphone 4 may be get damaged. So better you can use remote unlock method. It is the best and safe method to unlock your iphone4. You can get the remote unlocking service at low cost from this site http://www.theunlockspot.com/apple-iphone-4/rs16wp9/ and unlock carrier lock for your iphone4 easily.

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