I used Cellunlocker twice, in 2014 and just now in 2018, and I couldn't be more happy with their service. The first time they unlocked my iPhone 5 (blocked on Fido, Canada) in only a day. And this time they unlocked my iPhone 7 (T-Mobile, USA) in three days; I placed my order on Friday afternoon and the phone was unlocked on Monday afternoon.
The only thing is that this time I haven't received emails to confirm my order and notify me that my phone was unlocked, but I was able to follow the process on their website, so not a big deal for me. I'd definitely recommend them and use them again if I need it.
Bottom Line: Yes, I would recommend this to a friend
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