1. In a cellular mobile radio network having a voice channel for transmitting voice information and a control channel for transmitting control information that manages access to and use of the voice channel, a method of allocating a voice channel to a cellular mobile radiotelephone, comprising: a) transmitting a call origination message from the radiotelephone over the control channel, the call origination message comprising: i) a mobile identification number (MIN) uniquely identifying the radiotelephone; ii) a sequence of digits specifying a remote feature control request that invokes the forwarding of the sequence of digits by a serving mobile switching center (MSC) upon detecting the remote feature control request, and a count indicating time elapsed for a previous call by the radiotelephone; b) receiving the call origination message at the MSC; c) decoding the call origination message and detecting the MIN and the remote feature control request at the MSC; d) forwarding the remote feature control request and the count to a central monitoring station (CMS) associated with the MIN upon detecting the remote feature control request; e) comparing the count with a prepaid time associated with the MIN; and f) sending an approval message to the serving MSC if the prepaid time is greater than the count.