This paper reports on the results of service performance in FON network - Wi-Fi network where each hotspot has its owner, Fonero, who has priority in service, and the right to grant access to the limited number of visitors of his hotspot. Simulation model developed assuming that users in FON behave similar to the users in Wi-Fi, and taking into account service priority of Fonero. Results of simulation show that service rate for visitors in FON is a random value changing according to Fonero's behavior. Quality of service perceived by individual visitor depends mainly on his workload. High peakedness of users' workload during observation increases losses and delays in the system. Limitation in number of visitors at the spot does not necessarily improve service quality. Service accessibility degrades when peakedness of system occupation is increasing.