A device may establish a first connection to a first radio access network (RAN) associated with a first radio access technology (RAT). The device may register to receive a call service via the first RAN. The device may receive the call service via the first connection. The device may establish a second connection to a second RAN associated with a second RAT that is different from the first RAT. The device may register to receive the call service via the second RAN. The device may compare a first signal quality metric, associated with the first connection, and a second signal quality metric associated with the second connection. The device may cause the call service to be transferred from the first connection to the second connection, based on comparing the first signal quality metric and the second signal quality metric, without causing an interruption to the call service.