How to unlock/jailbreak iPhone 4? - 1

I want to unlock my iPhone but I'm not sure how to get it done without paying 70 to 80 quid for it, I will be willing to get it done for around £20 - £30.

I have the iPhone 4 on IOS 6.1.3 and I can't find a jailbreak for it

You can't jailbreak 6.1.3
Upgrade to ios 7 because i heard some devs are working on a jailbreak for ios 7.
A jailbreak for 6.1.3 will never be released because now it is outdated and everyone is upgrading to ios 7

I have bought an iphone 5 from Http://www.voseos.com one week ago, it is totally original and brand new, i'm very satisfied with it.

There's no jailbreak for 6.1.3 and even if there was, it's not going to help you get your phone unlocked.

The best thing is to pay for it to be factory unlocked. That way it will always be unlocked to all the networks.

You can check for jailbreaks here though http://www.isthereajailbreak.com

You can't jailbreak 6.1.3
Upgrade to ios 7 because i heard some devs are working on a jailbreak for ios 7.
A jailbreak for 6.1.3 will never be released because now it is outdated and everyone is upgrading to ios 7

Try www.howtoidevice.com