dointime1 , via OnePlus 6T , Nov 19, 2019 : About two weeks ago (Probably with the next Oxygen update) my phone stopped being able to send SMS over WiFi with my Verizon SIM. I know that OnePlus devices aren't fully capable on Verizon (like no calling or MMS over Wifi) so I called Verizon support to see if something had changed. They assured me there were no restrictions on their end. I contacted OnePlus support multiple times about the issue and received nothing that resembled competent tech support. Knowing that T Mobile fully supports OnePlus devices, I decided to get a T Mobile SIM. I cannot send SMS or MMS over wifi with my T Mobile SIM either. The problem is clearly with the OnePlus device but I can't get any support from OnePlus. Can anyone explain to me in Layman's terms how to roll back the latest update which is most likely the cause of my issues?