The subject matter disclosed herein provides methods for exchanging local and roaming messages between mobile devices using a mobile application. The method can receive a request from a first mobile device to initiate a communication session with a second mobile device. The method can further determine whether the second mobile device is out of zone. The method can further cause the first mobile device to display a first user interface based on the determining. The first user interface can provide one or more options to initiate an outgoing roaming communication session or an outgoing local communication session with the second mobile device. Related apparatus, systems, techniques, and articles are also described.