The Nokia C101 Unlocker v10 works by bypassing the phone's security mechanisms and generating a unique unlock code. Here's a step-by-step overview of the unlocking process:
Nokia_C101_Unlocker_v1.0.exe.
Find a trusted source (though we cannot link directly here, reputable downloads exist on archive.org and some GSM forums under the filename Nokia_C101_Unlocker_v10.zip ). The archive should contain: nokia c101 unlocker v10