Johan P.

First thing to say is I'm wary of those that claim very low prices - they rarely if ever work out. I picked Cellunlocker as they reflected the price I can get locally, all of whome said they needed my phone for a week! However I did NOT want my phone out of my sight. I decided to try online instead.
With some trepidation I tried out Cellunlocker online despite general warnings that online unlockers in general were poor if not downright dishonest.
First off their web site was clear, easy to understand and I selected my particular phone provider (as was) which was 3 Hutchison (UK). They advised the timescale which was perhaps some weeks, but I accepted that.
In the event it arrived much quicker in an email in just over a working week and I followed the YouTube video instructions.
It wasn't clear if you needed a signal and don't have one at home but it appears you don't need it anyway and I followed the instructions.
It did exactly what it said and my phone worked immediately with my alternative Sim card. It was really very easy and quick. Note the only thing it didn't do was remove the old provider's logo on phone start up, but that's of no consequence (I assume it's embedded somehow on the phone).
I'm now using my new Pay as you Go Tesco card and one very happy guy!
Cellunlocker contacted me again to ensure everything went OK - so I can certainly recommend them wholeheartedly.