Mobile phone client application authentication through media access gateway (MAG)

A mobile communication device. The device comprises a client application that checks a non-transitory memory of the device for a web application access token corresponding to the client application, determines that the non-transitory memory does not store the web application access token, transmits a web application access token request via a cellular radio transceiver of the device to a Media Access Gateway (MAG), where the web application access token request comprises an identification of an Internet Protocol (IP) address allocated to the device when authenticating into a radio access network (RAN) by the cellular radio transceiver, receives a web application access token from the MAG, stores the web application access token in the non-transitory memory, and sends a request to access a web application comprising the web application access token to a web application server, where the web application server is different from the MAG.