[Moto G4 Play Guides, News, & Discussion] jasonmerc:
UPDATE: Confirmed working on Squid's 11-08 build of Lineage 14.1 as well as various other Oreo/Pie ROMs

I've heard people making claims that the unlocked retail G4 Play (xt1607) doesn't actually work on Verizon's network--and this is true according to Verizon's own site even when you run the IMEI check. After a while I got everything to work just fine on mine, so I'll post here what I did and things I was told by the Verizon people. I apologize if it seems a bit unorganized, I just wanted to rush this out there ASAP since it seems like this is a known problem and I'd hate to see people returning their perfectly good G4 Plays for a supposed problem that got fixed

(Probably the most important thing here) They claim the activation process will take 5-10 minutes, but apparently this is a known problem with certain unlocked Motorola phones. Give it a few hours to see if it'll work eventually. This very well might be what eventually fixed it for me but I'll follow this up below with everything else we tried during this time anyway

Make sure you are running completely stock firmware so it can "provision" properly, at least initially. I remember with my friend's E4 Plus he had to be running on stock at first to get Verizon to recognize and accept his phone before he could flash Lineage on it and use it with that. Apparently this has something to do with outdated APNs that custom ROMs use, or perhaps Verizon just doesn't like custom ROMs at first and they detect/block it. Whatever the case may be, the TWRP Flashable Stock Nougat by Q9Nap will work just fine. What I did was a full wipe before flashing the stock firmware in TWRP. So not only did I do a factory reset, I wiped /system as well before flashing. To do this go to the Advanced Wipe menu in TWRP and check everything except Internal Storage and SD storage

When you're initially getting the SIM card for it, it seemed like they had to apparently tie it to an initial IMEI for it to work. Verizon's system of course said my G4 Play wasn't compatible but the rep said he'd put in another phone's IMEI that did work and then transfer it to my new phone once it was initialized initially. See if the Verizon rep can do this for you as well

If you give it a while running on stock firmware and it still doesn't fix the issue, proceed to the steps below

During the troubleshooting process the Verizon representative at the store took out my SIM card and put it in one of his Verizon phones to test as well. This was just to ensure the SIM itself is working properly which mine was. He made a couple of test calls and test texts with my SIM in his phone and it was all working fine. Obviously I'm no expert with Verizon's activation and provisioning process but perhaps this aided in the SIM being activated or whatever on their end. If you aren't at a Verizon store, find a friend or family member that has a Verizon smartphone and put your SIM in their device for a little while and do a test call or two

Go into the phone's hidden network menu (Dialer>*#*#4636#*#*>Phone Info) and set the Perferred Network Type to LTE/CDMA/UMTS Auto. Give it a minute or two and see if that changes anything

If none of the above is working, or if you're like me where you only had partial service (data/text is fine but cant make or receive calls because you're put in some weird restricted call mode on their network) go to TWRP and do another factory reset. Reboot afterwards and give it a few minutes to see if that fixed anything

If none of the above works or after factory resetting you lose ALL signal and its stuck in a Searching For Signal state (like mine was), go into fastboot and issue the following commands to wipe your phone's modem partitions/settings: "fastboot erase modemst1" and "fastboot erase modemst2". Reboot and give it a bit to see if that fixes it. This is what I believe finally fixed it for me

As of writing this I am running the TWRP flashable stock nougat and have full call/text/LTE capability on my G4 Play with the Preferred Network Type set to LTE/CDMA/UMTS auto. I couldn't get VoLTE working unfortunately, but the rest of the base functionality is all good (which is still better than others I've seen online that say their G4 Play flat out won't work at all)