Method for data communication of a mobile device on a local area network, having a mobile device communication system, on an authorized radiofrequency band; the method comprising the following steps: - determining a current data communication mode, said current data communication mode defining at least a radiofrequency band for communicating data; said determination of said data communication mode being performed using: a) a piece of geographical localization information obtained from a mobile communication network or a satellite-based positioning system; or b) a data communication mode obtained from a data frame exchange on said local area network; - if the determination step is successful: ∘ enabling a data communication state of the mobile device wherein use of a radiofrequency band defined on the basis of said current data communication mode for data communication between the mobile device and the local area network is allowed; or, - if the determination step is not successful such that no valid data communication mode can be determined: ∘ entering a silent state; and ∘ entering a sniffer mode; wherein the current data communication mode is associated with a validity time period and wherein the method further comprises the following steps: - verifying a validity of the current data communication mode based on a current time and the validity period, and entering a silent state and or a determination step if the result of the verification step is not successful, - receiving the validity time period for the current data communication mode in network messages from a current leader node of the local area network, - updating the validity time of the current data communication mode according to the information transmitted by the current leader node in the local area network, - immediately enabling the new data communication mode communicated by the current leader node of the local area network. - determining a current data communication mode, said current data communication mode defining at least a radiofrequency band for communicating data; said determination of said data communication mode being performed using: a) a piece of geographical localization information obtained from a mobile communication network or a satellite-based positioning system; or b) a data communication mode obtained from a data frame exchange on said local area network; a) a piece of geographical localization information obtained from a mobile communication network or a satellite-based positioning system; or b) a data communication mode obtained from a data frame exchange on said local area network; - if the determination step is successful: ∘ enabling a data communication state of the mobile device wherein use of a radiofrequency band defined on the basis of said current data communication mode for data communication between the mobile device and the local area network is allowed; or, ∘ enabling a data communication state of the mobile device wherein use of a radiofrequency band defined on the basis of said current data communication mode for data communication between the mobile device and the local area network is allowed; or, - if the determination step is not successful such that no valid data communication mode can be determined: ∘ entering a silent state; and ∘ entering a sniffer mode; ∘ entering a silent state; and ∘ entering a sniffer mode; - verifying a validity of the current data communication mode based on a current time and the validity period, and entering a silent state and or a determination step if the result of the verification step is not successful, - receiving the validity time period for the current data communication mode in network messages from a current leader node of the local area network, - updating the validity time of the current data communication mode according to the information transmitted by the current leader node in the local area network, - immediately enabling the new data communication mode communicated by the current leader node of the local area network.