Thank you for instruction!
Just want to share my experience.
HTC One M8 Sprint. Tried changing cid and config.dat method with no luck. Phone still says "invalid sim card". This thread was my hope. Done steps in first post, but no luck again, Sim Unlock Helper app even didn't write anything to log history, so I lost a hope, but tried executing "sim lock" command in app several times, then rebooted phone several times and eventually it became unlocked. Good luck!
If I put in a Verizon 4g LTE sim card (used or new) or any other non AT&T/T-mobile sim, the missing SIM icon disappears even with the GSM/UMTS option selected. Further, the search networks option is no longer grayed out and I am able to search for networks and it even shows me AT&T and T-mobile. Obviously, when I click on AT&T or T-mobile, it says SIM won't allow registration (which is expected since it's a Verizon sim that I am trying to use to connect to T-mobile).
I tried several different stock RADIOS but the same issue is there. I think Sprint looks at the SIM ICCID and if it's in the AT&T or T-mobile range, it blocks it outright. Oddly the Verizon ICCID ranges have not been blocked, nor have they blocked and global GSM SIMs.
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