Last year I made note of the number of offers I was receiving from AT&T to switch our landline to their VoIP service, which we did later in the year. We now have a cellular receiver in the top floor of our condo that has a battery for power failure and is plugged in to the phone jacks of the house so that we can continue to use our phones. The point where our house was connected to the AT&T landline network outside was disconnected. Key thing to note is that there is no failover to my Internet service in the event there is a loss of cellular connectivity. If the cell tower goes out we lose phone service.