PUC §2886: (a) The commission shall require every telephone corporation furnishing mobile telephony service, as defined in Section 224.

(a) The commission shall require every telephone corporation furnishing mobile telephony service, as defined in Section 224.4, to establish a pricing system made available to subscribers that shall distinguish on the billing invoice charges to a subscriber for calls not completed from any other service charge on the billing invoice. (b) The commission shall require that those calls which are not completed shall not be charged more than 50 percent of the charge established for completed subscriber initiated calls. (c) For purposes of this section, a call is not completed when it originates from the mobile telephony service handset and any of the following occurs: (1) The terminating line is busy and the originator receives a busy signal. (2) The terminating line does not answer and the originator receives an audible ring. (3) No radios are available and the originator receives a reorder signal. (4) The mobile telephony switching office cannot connect the call to the public network and the originator receives a reorder signal. (5) The public network cannot complete the call to the terminating number and the originator receives a reorder signal.