Not all Sprint devices have an MSL code or a locking function that can be unlocked by Sprint (e.g., Apple devices cannot be unlocked to accept another domestic carrier's SIM card). On certain devices, not all functionality may be unlocked (e.g., for some smartphone devices, Sprint may be able to unlock the CDMA/voice functionality of the device but unable to unlock the GSM/UMTS/LTE portion of the device). Even if unlocked, Sprint devices will not necessarily work on another carrier's networ