What BCSMom said. We have had Verizon here for 13 years. There have been some random issues. Mostly reliable but with some speed issues. (gamers in the house) We added Suddenlink, which although popularly nicknamed "SuddenDeath", we've suffered only a few slow downs and no real outages.
The gamer herd uses Verizon and we adults, who work from home use the Suddenlink. For the longest time, the herd of gamers was completely unaware of Suddenlink.
Then, along came Frontier. We hit 24 hours of no service last night.When I had a "chat" conversation with them yesterday, they told me they had no ETA on the entire B/CS outage. Last night, when our businesses that are dependent on internet to process credit card transactions were STILL down, I took to their FB page to complain. They kept responding with "oh, hey hey... we're feeling your pain. Please PM me" - Sara or Brittany or some other name. When I PM'ed, there would be no reply..... Until I screen shot it and posted it to my thread on their page. Then they would message me. They wanted all this information to "investigate" how they can help me. I was not looking for an account credit. I'm still not. I just wanted my businesses to be able to process credit card transactions.
TL;DR version - Avoid Frontier, formerly known as Verizon.