@Oldman2 , SIM lock is done at the factory when phone are produced. Since December 1, 2017 SIM locked phones have been banned in Canada. If a phone is SIM locked to a source carrier, that carrier will provide an unlock code free of charge. Otherwise using a phone on a particular service will not relock the phone to that service. Some brands such as LG require network resets when switching from one brand to another. This is different from SIM lock and something the customer can do on their own through setting menu.
