There are several websites that offer unlock codes for mobile phones or details for how to find them, including Unlock.NokiaFree.org and GiffGaff.com. To find the correct unlock code, users must provide the make and model of their phone, as well as the phone's IMEI number.
Free unlock codes for older phones are readily available. Unlocking modern smartphones may require the use of a premium service or assistance from a professional.
In some cases, networks offer a free unlocking service, so smartphone owners should contact their cellular service providers before pursuing other options such as online code-based unlocking services.
Unlocking a phone can void the phone's warranty.