OnePlus 9 Pro Calls Problem

david10225 wrote:

I could sure use some help.  Intermittently, when I make calls with my OnePlus 9 Pro, the callers can't hear me, but I can here them.  I'm frustrated because I spent 90 minutes on the phone with tmobile last week and had to pass through several layers of support before I could get someone who could help me.  I thought it was fixed, but same problem started again today.  I'm willing to try anything.  I bought my phone directly from One Plus and just moved my tmobile sim card from my old One Plus 6 to this new phone.  One additional thing is my phone and my wife's identical phone both say they are "unknown" phones when I look on my Tmobile account.  Is there anyone who can help or can I get support without having to go through so many layers at first?

Devices not purchased from T-Mobile will show as an unknown device.  That doesn't impact how they function on the network.  How old is your SIM?  You might want to consider picking up 5G capable SIM's, like the SIM's with R15 on them.