Roaming between hotspots is similar to roaming in GSM networks. WiFi aggregator provides possibility for hotspots, to authenticate users in external database. Authorization is done through the Internet. There are two practices of user logging-in to a given hotspot. First, roaming operator requires client software to be installed on the device trying to connect to the access point. Every time the user tries to connect to the hotspot, aggregator specific software configurates his device to properly communicate in the network. The second approach is to have the same configuration on the user’s device and all aggregated hotspots access controllers. Then, in both cases, user receives the login page, where he…