time services to be administered at site 200 suppose that a call is initiated by originating subscriber 220 and is received at site 200 at site 200 call processor 210 determines an originating identification number received from originating subscriber 220 for example call processor 210 may determine the identity of an originating mobile phone subscriber by determining its mobile identification number min call processor 210 also determines a destination identification number corresponding to the destination of the call call processor 210 determines whether the call is a toll call or not a call will be a toll call if the subscribers are in different areas for which a toll is imposed for connections there between the call will also normally be a toll call to either subscriber that is a mobile subscriber regardless of whether the mobile subscriber originated the call or is the destination thereof if the call is a toll call then processor 210 will determine if either subscriber to be tolled is a subscriber to prepaid call time administered at site 200 if the call is not a toll call to either subscriber then no prepay functions will be performed with respect to the call if the call is toll then processor 210 will determine if the subscriber to be tolled is a subscriber of prepaid call time services to be administered at site 200 if the originating subscriber is to be tolled.