A method can include detecting local devices with a wireless first communication interface (IF) of a gateway device; authenticating at least one local device with the gateway device, including by operation of the first communication IF and a second communication IF, relaying secure communications between the at least one local device and a server to enable authentication of the at least one local device by the server, and after receiving authentication of the at least one local device at the gateway device, transmitting user information for storage in a secure memory of the authenticated local device; and operating the gateway device as a common access point to the network for any of a plurality of local devices authenticated with the gateway device. Related systems and gateway devices are also disclosed.