We have recently received some reports from other suppliers that some IMEIs that have been unlocked on iOS 7 have relocked after updating to iOS 8 through iTunes. This is a known bug with iOS8 and to prevent this from happening we reccomend that you do one of the following.
1. If you ordered an unlock and the phone is still on iOS7.
Activate the unlock on iOS7 then update via Wifi (Do not update through iTunes)
2. If you plan on ordering an unlock from us or any other supplier.
Update to the latest iOS8 with iTunes, then order the unlock and activate over wifi once you receive the unlock confirmation.
As this bug is software related we are unable to offer any refunds should the above steps not be followed.