Live in Capitan NM     We have same issue over the past 6 months.  Verizon says their service here has been investigated and just fine THAT it is our issue with our phones or just the number of people using service.   REALLY look up Capitan NM--how many Verizon customers you think there are here.  Three cell phone towers within 20 miles.  THINK Verizon is just choosing to whom and when they will allow customers access while making them pay full price.   Going to State public utilities commission and FCC next.