: Web-based tools where you enter your IMEI to receive a code.
: This is one of the most well-known free tools for older Nokia models. While it supports many devices, users often find that newer BB5 SL3 (SIM Lock 3) versions of the C3 require more advanced server-based calculation. Nokia c3 unlock code calculator software
: Most carriers will provide the unlock code for free if the device is out of contract. This is the safest method as it does not risk "hard-locking" the phone. How to Enter the Unlock Code : Web-based tools where you enter your IMEI