It sounds like a wire-line provider issue, Though I'm surprised if all wireless cariers are using wire to pass the traffic..
Another possible issue is intentional interference.. It is possible to knock out cell phones over an area. how wide an area is determined by how much you spend on hardware.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times