{TAIL ~ The method} of {HEAD ~ the present invention} includes the steps of monitoring a subscriber unit which serves to initiate the desired service, and detecting when the subscriber elects to obtain the predetermined service from one of the service providers 
{ TAIL ~ The method } of { HEAD ~ the present invention } includes the steps of monitoring a subscriber unit which serves to initiate the desired service , and detecting when the subscriber elects to obtain the predetermined service from one of the service providers
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