Iphoneunlockuk offers to unlock your iPhone for a fee of £19.99 when you fork over your money you get an email directing you to a free offsite link that is not even made by iphoneunlockuk.
You are also pointed to FREE software to jailbreak your iPhone.
The front of the website claims to unlock any firmware iPhone including 3. 1. 3, when you signup you get an email saying stay away from 3. 1. 3 firmware as there is no unlock.
PLEASE stay away from this website as they charge you for free website link and free software