Default [Q] Sim unlock site recommendations?


I have an S4 on EE (UK). Completely stock - not rooted either. Latest ORA updates. I got it in Feb 2014 I need to use it for a couple of months with a Vodafone SIM.

Are any of the SIM unlock web sites reliable and do they work? Can anyone recommend one for me please

Many thanks
iPhone 5s (ok, don't give me hassle )
Samsung S4 (factory)
Asus TF201 32GB (UK)
Rooted and Unlocked!!!!

A little knowledge is dangerous, a lot of knowledge is suicidal