A communication device may include a radio access technology (RAT) controller and two RAT receivers operatively coupled to the RAT controller. The first RAT receiver may be associated with a first RAT, and the second RAT receiver may be associated with a second RAT. The RAT controller may be configured to receive, using the first RAT receiver, while the second RAT receiver is off, a notification of an incoming voice call. The RAT controller may be further configured to cause the second RAT receiver to establish a connection with a wireless network cell associated with the second RAT and to receive the incoming voice call.