Boston has HD voice service, which may or may not be on your phone. Try resetting network settings, you may have to sign into wifi again, but it will not effect your content.
if that doesn't help, please visit a Verizon store to check carrier settings.
Thank you. I think it may be related to the radio and TV signals in the building where I used my phone. I think this is affecting the signal strength, AndrewT_VZW. Thanks for your response.