Sec.  22.927   Responsibility for mobile stations.

   Mobile stations that are subscribers in good standing to a cellular system,
   when receiving service from that cellular system, are considered to be
   operating under the authorization of that cellular system. Cellular system
   licensees are responsible for exercising effective operational control over
   mobile stations receiving service through their cellular systems. Mobile
   stations that are subscribers in good standing to a cellular system, while
   receiving service from a different cellular system, are considered to be
   operating under the authorization of such different system. The licensee of
   such different system is responsible, during such temporary period, for
   exercising effective operational control over such mobile stations as if
   they were subscribers to it.