We used to have excellent Verizon coverage where I live (northern part of La Canada) but over the past 9 months or so, the service is very poor. Calls are frequently dropped and at times, we get a "no signal" indication, even when outside of the house. Can anything be done? We noticed new cell towers were installed about 2-3 years ago, but I'm assuming they are not used by Verizon given our poor coverage.