A method for attachment and authentication of a user terminal of a home type radiocommunication network with a visited type radiocommunication network, the home network including home means for attachment to a packet network and the visited network including: at least one visited base station able to ensure radio transmission and reception with user terminals located in at least one visited cell attached to the visited base station; visited authentication and control means of user terminals able to authenticate the user terminals attached to the network; and at least one visited distribution gateway ensuring radio reception and transmission with the at least one visited base station.