Why are cell phones locked?

Cell phones are often locked to specific carriers to ensure that users remain tied to a particular service provider for a set duration, typically associated with a contract or payment plan. This practice helps carriers recoup costs associated with subsidizing the phone's price. Additionally, locking phones can prevent theft and unauthorized use, as it restricts the device to a single network. Users can usually unlock their phones after fulfilling certain conditions, such as completing the contract or paying off the device.