I am extremely satisfied with the service I have received from CellUnlocker.net Here are the points that made me super comfortable.
Paypal to process the payment, so they don't have access to your payment method.
Real time status tracker.
Customer Service Support.
Refund with proof if ever required.
Now, i've unlocked 7 iPhones in the past. I've never really considered an online option because I find it sketchy. My friend recommended this website, so I trusted him. Just to be on the safe side I looked at the reviews and whatnot, and they were all positive. Gave it a go, and am super glad. I've unlocked my phone much faster than previously and saved close to $50.00.
Amazing company and service, would highly recommend to others.