I Live in the 79423 zip code area and have absolutely no service. I was told the tower was down but my husbands phone( exact same model) is working just fine.
I'd pull your battery, reset your phone, do all the updates of software and data profile.
This one actually sounds like a device issue - if his phone is working properly at the same location.
I dont understand if you and your husband both have the LG FLEX which again here on the forums this is a triband phone . You both should be having the same problems across the board. If its a area problem then his phone should also mimic these problems.