I'm using a Pixel2XL on T-Mobile and the native Visual Voicemail (built into the Google Phone app) will not activate. The VM tab does show, and I have the option checked in the menu settings for the Phone app. I continue to get the messages "Visual Voicemail Activating" and "Can't activate Visual Voicemail". I have VVM on my plan via the ONE Plus add-on.
I have removed the T-Mobile VVM app as I know that it will deactivate the native VVM. I have reset network settings, restarted the phone, and spoken with both T-Mobile and Google. I have yet to be given a reason this is not working.
(Note: brought the phone over from Verizon but it's unlocked - all other data and voice functionality is good)
Best answer by tmo_mike_c
For folks wondering if their Native VVM app will work on T-Mobile’s network, here’s some helpful info. The native VVM app on Non-T-Mobile devices isn’t something T-Mobile can guarantee will work with the VVM service. This goes for other native apps as well. We recommend folks download T-Mobile Visual Voicemail app I’ve linked below and use the VVM service through that app. The second link I posted below is for troubleshooting if you happen to run into any issues.
We have a couple articles that can help with this. Check out the two links below in relationship to the issue.