Replacing the SIM card (Straight Talk -> T-Mobile). Initial Message: SIM card invalid Many thanks to all contributors in several forums for all of the education and contributions of time/talents/work of which I have gleaned measurable experience. Action: 1) Got the NCK/NP Code but could not get a menu option to enter it. 2) Custom ROM (stock minus bloat). Current Message: SIM network unlock PIN menu Action: 1) Tried NCK/NP Code -- Not accepted and "attempt counter(10)" decremented. Lock Screen Message: Phone is SIM service provider locked Config Changes: Rooted, sd-ext4, CWM 5.x, Custom ROM Current Config: Android Version: 2.3.4 (after ROM -- was 2.3.5) Kernel Version: 18.104.22.168 (zte stock) Build Number: "Custom ROM" Summary: 1) Config changes produced a "Unlocking Menu" that requires a PIN which is apparently not the same as a NCK/NP code. Questions: 1) Where is this offending App (ROM/Kernel)? 2) Where is this "unlock counter attempt" file? 3) Is there a maint code to bypass this menu?