As installer, sometimes the customers don't have a telephone service but if you have a phone jack live(to be able to dial 911 only), in that case the receiver will reconize a phone line connected and you don't have to pay the $5 access fee for the 2nd receiver but you won't able to make any connection for pay-per-view or interactive feature.
Believe me I did that several times down here in Florida.
Believe me I did that several times down here in Florida.