Performing data communication using a first radio access technology (RAT) while performing a voice call using a second RAT, using a first radio (e.g., a single radio for cellular communication. The UE may use the first radio to initially perform first data communication using the first RAT. During the first data communication the UE may not be communicating using the second RAT or may not generally maintain a connection to the second RAT. Subsequently, the UE may receive an indication to perform at least one of a mobile originated voice call or receive a mobile terminated voice call using the second RAT. Accordingly, the UE may perform the voice call using the second RAT in response to the indication, using the first radio. Additionally, the UE may perform second data communication using the first RAT during the voice call, using the first radio.