Abstract: The present application discloses methods, devices, servers, and systems for notification between mobile terminals during communication. When two mobile terminals are in an active communication session, sometimes one terminal fails to respond to the other terminal due to various reasons such as distractions, additional responsibilities, or technical difficulties. The mobile terminal that is not getting a response may then utilize the process herein disclosed to notify the other terminal that a response is expected. By shaking or other convenient approaches, a mobile terminal may send out a notification request during an active communication session. The other terminal may return a notification response indicating whether the other terminal is in a current communication with a third mobile terminal or is in an idle status.