Their service is perfect! It worked with my iPhone 4 iOS 5. 1. 1. I could finally switch from the old to my new operator. I've been struggling for 10 days, trying all possible ways to unlock it (even all jailbraking resources), and nothing worked, even all jailbraking attempts I did. I waisted so much time... Luckely I found Cellunlocker.net It took 2 business days to have it unlocked.
I just had to plug my iPhone to iTunes, and the message "Unlocked" from Apple appeared. So easy... Took only 2 business days
I'll use your service again in the future for sure!
Thanks again!
André from France