My last two AT&T bills have included a number of calls which we did not make. (eight on the last bill for dates we were not at the cabin and it was locked up) The charges were minimal and AT&T reversed them. They think there may be a crossed line and asked if we had heard other conversations on the line. We had not. We use this line as backup for emergencies only, usually using our cell phone and an AT& T microcell. However that is reliant on Comcast. Hence the backup plan. Anyone else experiencing this problem?