Service will get you the NCK unlock code for any of the new ZTE models locked to AT&T USA network. Device should ask for NCK, if you need SPCK or device unlkock app we will not be able to get you refund.
Codes are 100% correct and there is no verification/refunds.
Wrong carrier junk IMEIs are unsupoorted and will get you junk code.
No refund is available.