I just got the OP7T Pro McLaren about 2 months ago when switched to TMo. Ever since I have had issues with calling over Wifi. Basically 80% of the calls in and out the person on the other end comes out completely garbled and can not hear them. I would have to turn off WiFi during the call, then the call is 100% clear. I work in areas that I can not get cell service so I use this often. I called into TMo, have flushed network settings, restarted phone, turned on airplane then turned off, factory reset phone, and as of today, received a replacement phone under warranty that is having the exact same issue.
I had this sent to the engineering team twice, first said they resolved the issue. Next call was worse than before. I just got off the phone with support and they sent another ticket it. Am I the only one having this issue? This has to be a software issue. I contacted OnePlus directly and they only said to replace or wait for OTA update, which they said it is up to TMo as to when it is sent out.