US Patent 11638141 Remote sim unlock (RSU) implementation using blockchain

A permissioned blockchain can be a decentralized data store that maintains information indicating whether user equipment (UE) is SIM locked and/or should be disabled. A UE can access the blockchain during boot up to determine if it should be disabled and not booted into a normal operating environment, and/or whether it is SIM locked to a particular carrier. Authorized entities, such as carriers and UE manufacturers, can update the blockchain to indicate that certain UEs should be disabled, are SIM locked, are not SIM locked, and/or whether it is permissible to remove SIM locks from those UEs.