Via our iPhone simlock status tool you can check this information in seconds. Knowing whether your phone is locked to a specific carrier or not is valuable information. If your phone is sim-locked, it can restrict your freedom to choose a different mobile provider or use a SIM card from another carrier. This can be particularly useful when planning international travel and wanting to use local SIM cards to avoid high international roaming charges. Knowing the lock status is also important when purchasing a used phone to ensure that the device is not tied to a particular carrier.