It’s not like us to be less than optimal, E324768. You’ve taken great initiative with that Network Settings reset. Let us gather additional clues. Do you know of other Verizon customers experiencing the same where you are? The reason we ask is that we want to determine if we should be looking into the area or the device. What iOS version is your iPhone 6s on?
https://support.apple.com/en-us/HT201685
DavidH_VZW
Follow us on Twitter @VZWSupport
If my response answered your question please click the ?Correct Answer? button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!