We've had it for a year and a half without a problem. The other day it was unplugged (the power) mistakenly and it ran out of battery. When I plugged it back in, everything looks fine except there's no dial tone. So, the electronic display on the phone is fine and holding data, just says no baseline. It's plugged directly into the modem, the modem is showing all bars and power. I've unplugged everything and replugged everything back in.
Okay, every IT person will roll their eyes, I hadn't tried turning off the power and switching it back on …