A wireless device includes a wireless local area network (WLAN) transceiver configured to (i) selectively transition between operating in a power save mode and operating in a full power mode, and (ii) while operating in the full power mode, wirelessly communicate with a second wireless device. The wireless device also includes a mobile phone radio transceiver configured to receive, in accordance with a mobile phone protocol, time information from a first base station. The time information is based on a time reference maintained by the first base station. The wireless device also includes a controller configured to instruct the WLAN transceiver to transition to the full power mode upon expiration of a sleep period. The controller determines the expiration of the sleep period based on (i) the time information and (ii) an offset between the time reference and a second time reference maintained by a second base station.