Who I have the same questioned this topic

My son and his family recently moved to a new home in Ellendale, DE.  During voice calls voices cut out or at times are garbled.  Text messages with attached pictures or videos intermittently fail (more often than not).  This has been the case for two months now and occurs on all VzW phones - iPhone and Samsung. Data seems to be OK but not thoroughly tested. The zip code is 19941.  Thank you.