Method for the transmission of data from a data transmitter to a server with at least one predetermined quality-of-service level, the data being transmitted by means of a cellular network using frequency sub-bands, the method comprising the steps performed by the transmitter of: - selection, by a modem of the transmitter, of at least one sub-band from the frequency sub-bands of the frequency plane enabled for the transmission of data to the server, - obtaining, by the transmitter, of at least one selected frequency sub-band, - obtaining of information representing the quality of service of the connection between the transmitter and the server, - checking, by the transmitter, whether the information representing the quality of service of the connection between the transmitter and the server is superior to or equal to a predetermined quality level, - transfer, by the transmitter, of the data to the server if the information representing the quality of service of the connection between the transmitter and the server is superior to or equal to the predetermined quality level, - notification to the modem, by the transmitter, of a prohibition of selection of at least one previously selected frequency sub-band if the information representing the quality of service of the connection between the transmitter and the server is not superior to or equal to a predetermined quality level, - performance, by the transmitter, of the selection, obtaining and notification steps as long as the information representing the quality of service of the connection between the transmitter and the server is not superior to or equal to the predetermined quality level, said method being characterised in that, if all the frequency sub-bands of the frequency plane are prohibited, the method further comprises the step of notification, by the transmitter to the modem, that the prohibited frequency sub-bands can once again be selected, and performance of the selection, obtaining and notification steps as long as the information representing the quality of service of the connection between the transmitter and the server is not superior to or equal to the predetermined quality level, - notification by the server of an absence of reception of data from the transmitter if no data is received by the server during a predetermined period of time. - selection, by a modem of the transmitter, of at least one sub-band from the frequency sub-bands of the frequency plane enabled for the transmission of data to the server, - obtaining, by the transmitter, of at least one selected frequency sub-band, - obtaining of information representing the quality of service of the connection between the transmitter and the server, - checking, by the transmitter, whether the information representing the quality of service of the connection between the transmitter and the server is superior to or equal to a predetermined quality level, - transfer, by the transmitter, of the data to the server if the information representing the quality of service of the connection between the transmitter and the server is superior to or equal to the predetermined quality level, - notification to the modem, by the transmitter, of a prohibition of selection of at least one previously selected frequency sub-band if the information representing the quality of service of the connection between the transmitter and the server is not superior to or equal to a predetermined quality level, - performance, by the transmitter, of the selection, obtaining and notification steps as long as the information representing the quality of service of the connection between the transmitter and the server is not superior to or equal to the predetermined quality level, - notification by the server of an absence of reception of data from the transmitter if no data is received by the server during a predetermined period of time.