Both indoors and outdoors, with four or five bars of 4G reception. Usually one of us is indoors and the other outdoors, but sometimes both are outdoors.
Installed the Verizon app on one of the phones. The other doesn't have enough memory left. The Verizon app is larger and the app that came on the phone apparently can't be removed.
The delays continued. Tried sending to two different phones in case the problem was with the phone with little memory left.
I am not backing up device information, at least not that I know of. I download photos as I take them, so my data should be ok.