General Unlock iPhone 4 Orange UK how?

[kanko]

Hey guys a friend of mine bought a iphone 4 locked one (very stupid) how do I unlock it it has baseband 4.12.2 is there any site(no scam site plz) that unlocks it?

 

[labman]

IEMI though carrier or grey market check this thread you will have to find a grey market that unlocks orange UK https://forums.macrumors.com/threads/1398957/