I have an iphone 5 locked to Orange Switzerland so when I come home to the UK I have to use a different phone which is about to give up on me. Rather than buy a new phone to use 3 times a year, I started looking into unlocking my iphone and came across this website http://www.officialiphoneunlock.co.uk.
Many reviews and facebook likes etc. so seem legit. Costs £55 to unlock my phone and they claim its an official unlock through itunes which won't affect any future updating etc.
Has anyone used these guys or a similar company?