I'm with RP verizon. This has also happened to me. It was due to wrong APN info.
What works for me (in USA) is:
APN = VZWINTERNET
MCC = 311
MNC = 480
APN type = default,dun,supl
APN roaming protocol = IPv4/IPv6
APN enable/disable = enable
Bearer = LTE
All other options = disabled or none
I also have had trouble with Verizon MMS. I use Textra and it will try to use WiFi to get pic attachments but sometimes fails, so you must have Cell Data enabled to work reliably.
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