A WLAN router connected via a cellular network (e.g. LTE) to the Internet is disclosed; a plurality of SIMs (subscriptions), each associated with a user of the router, may be plugged into the router (or soft SIMs used); simultaneous Internet access for a plurality of users is achieved, even if the WLAN router does only have one TX/RX equipment, by the following features: the WLAN router—when receiving a portion of network traffic for a user—determines the subscription that the portion is associated with and updates a data usage quota for the subscription accordingly by an amount of data corresponding to said portion; thereafter, it is decided whether future network traffic for that subscription shall be transmitted over the same network connection or another subscription's network connection based on the updated data usage quota; thus, the router carries out load balancing between the subscriptions.