THIS SERVICE PROVIDED ONLY NCK (Network Unlock Code)
SAMSUNG: Check that your phone does not request a code other than the NCK and that when you insert a not accepted sim it requires the code unlocking network and not UNFREEZE code or PUK code etc...
If the code does not work, this is because your Samsung is Freeze, and therefore the code will not work, no refund can be requested because the codes come from Samsung Database directly.
This works for Galaxy Z Flip3 5G F711U Z Fold3 F926U from any Usa network that asks for code,basically AT&T Spectrum.
There is no refund if we deliver the code but you can not use it because the phone is not asking for unlock code with a sim from a different carrier!