The present invention relates to a system for rerouting independent traffic on the networks of the mobile telephony operators, such as the GSM network, as well as the use of methods for user authentication and activation, traffic control and user access on a 3G-traffic rerouting Wi-Fi network. The rerouting Wi-Fi network proposed is independent of the mobile telephony network operators and enables the data traffic rerouting service to be provided to users of several operators simultaneously. The system includes its own database containing user information, obviating the need to consult operator databases. The system proposed also enables a user of operator A to purchase a Wi-Fi data plan from operator B using the International Mobile Subscriber Identity (IMSI) authentication of operator A, thereby obviating the need to replace the SIM card. Access to roaming users, i.e. users outside their native numbering area, is also permitted.