Will jailbreaking my iPhone 4 unlock it from Three for all networks?

[ScarySquirrel]

If so, what's the best way to jailbreak it?

I'm on iOS 6.0.1.

Thanks

 

[ScarySquirrel]

I've just spent 3 hours trying to get it unlocked with 3. They don't have my IMEI number on their database as Apple replace the phone 6 months ago, and the receipt I have doesn't have the old or new IMEI on it, therefore I'm screwed.

I've seen there are some apps on Cydia which claim to unlock the phone. DOes anyone have any experience of these?

 

[ScarySquirrel]

I've already transferred my number to Giff Gaff. My signal with 3 was terrible and I always got cut outs and loss of signal.

I've had to Photoshop my Apple receipt with the old and new IMEI numbers. I've just sent it to them so fingers crossed it'll fool them.