A method for providing telecommunications services in an environment in which a plurality of telecommunications systems operate according to different standards (WLAN, UMTS) and are reachable from a terminal (T) in an integrated manner, wherein at least one of said services can be provided by more systems. Upon the provision request for the above-cited service, the method according to the invention envisages the steps of: —verifying the availability for the provision of the requested service, of at least a first (WLAN) and a second (UMTS) system, and —selecting, in an automatic and dynamic way, one between at least said first (WLAN) and said second (UMTS) system for the provision of the service being requested.