I keep my phone on vibrate (i.e., no sounds) all the time, but I find that my phone only vibrates when I receive a new text about 50% of the time. At first I thought this might be a phone issue, but it's happened for three different phones that I've owned (HTC Thunderbolt; Droid RAZR Maxx HD; Samsung Galaxy S6 Edge). I've checked the settings on the phone and on the texting app(s) about a million times. It's really annoying because about half the time I don't notice that people are texting me. Any ideas? Is it possible that there is an issue on the Verizon side?