If your device is on the list at the bottom of the page, it is unlocked. If in doubt, insert the SIM card that Videotron gave you into your device. If the device is locked, a message will prompt you to enter an unlock code. Make sure to correctly enter the unlock code. Generally, after three failed attempts, the unlock code is no longer valid. If your mobile device is already unlocked, you will not be asked to enter an unlock code. 

 
Good to know: if you purchased your mobile device from Videotron after December 1, 2017, it is already unlocked by default.

• You must have purchased your mobile device from Videotron;
• You must provide the correct International Mobile Equipment Identity (IMEI, or IIEM in French). You can get your IMEI by dialling *#06# from your phone’s Telephone application. The IMEI is composed of 15 digits (no spaces);
• The device must not have been declared lost or stolen;
• Videotron is only authorized to unlock devices they have sold. If your device is from a different service provider, you need to contact that service provider.