It looks like you're new here. If you want to get involved, click one of these buttons!
I figured it might be useful to make a post about this since I found limited information when googling. I initially bought the Azon 7 to upgrade from my Samsung Galaxy Note 3. Out of the box I was very pleased with it, and then after some clever wordplay (outright lying) at the Verizon store I was able to get them to activate a nano-SIM for me with my number since I didn't have one yet. When I put the nano-Sim into the A7 everything was great at first. I had complete functionality, including LTE with the known roaming-icon bug. Then, the problems started. I'd lose LTE and it wouldn't come back unless I toggled airplane mode or restarted the phone. After doing these fixes the amount of time that I had LTE got less and less, until eventually the fixes stopped working. I read lots of supposed workarounds about messing with the APN and the radios, etc, etc, and nothing worked for me. I was hopeless, so I made a thread on here. Board user FlyerAndy responded with a fix that had worked for him. You shut down your phone, put in a GSM SIM, restart, and then let the phone get those settings for a couple minutes. Then you shut down, put your VZW SIM back in, reset a time or two, and it should be working great. This worked flawlessly for me. My phone's radios toggled as necessary and I was pretty much always on LTE. Everything was perfect and I had no issues whatsoever...
I was very excited for the Nougat roll-out, so I downloaded the update immediately. This was a big mistake. Immediately I began experiencing the same issue as before. Not only that, but the phone was laggy and a lot of apps that I used regularly were choppy and clunky. I tried the GSM SIM trick again, and this time it did not work. I poured over these forums looking for any trick and trying everything that was suggested. Nothing worked. So, I downloaded the latest version of Marshmallow and reverted my phone back to that previous version by putting it on my SD card and accessing the bootloader menu and installing android from my SD card. As soon as I went back to Marshmallow everything was fine again. I happily used Marshmallow for months. Then last night I saw somebody talking about this most recent ZTE update and that it had some promising bug fixes. So, I figured "why the hell not?" and backed my phone up, prepared a file with the version of Marshmallow that I've been running, and accepted the update on my phone and held my breath... Once the update was complete I immediately had no signal again, so I went into settings and went straight to the new version tab to get the latest version. Once this update was complete it was amazing. I had full LTE with no "roaming" icon. Everything was working flawlessly, except a little lagging here and there. So, I went and wiped the cache partition, and that legitimately fixed every issue. Right now the phone is amazing. I'm looking forward to messing with the daydream VR.
TLDR; If you are a Verizon customer, there are ways to make your phone work great with their network. If you are a Verizon customer still using Marshmallow, update to Nougat, then go get the next update immediately after the Nougat install, and you should be all good.