Uniden DECT 6.0 Cordless Phone ID "pick cell frequencies" Questions

...a message waiting for me on the teleco's answering machine. It went off when all the messages were picked up. Last week, I switched to ATT U-Verse. They use VoIP for the telephone service. My

...pick up the reciever, then when I hit the intercom button, the display reads: Intercom To - then a flashing black square. PLEASE PLEASE TELL ME HOW TO USE THIS INTERCOM. THANK YOU!!!!!!!!!!!!!!! My ...