N900W8 Unregistered SIM aftre unlock 4 weeks

N900w8 unlock successfully

Network test all OK

but several weeks later

customer bring it back said no network

put all my active sim card to test

all show me "unregister SIM"



is the superIMEI become backlist ?

should I redo unlock again?

How to fix the problem?

via Welcome to gsm-tips http://ift.tt/1n77uwV