Android 10/BV9900 Pro/AT&T: *86 not working and VM change won't stick

[Android Central Question]

Hi, I have Android 10 on a Blackview BV9900 Pro with AT&T as my service provider.

Since getting the phone, my voicemail, which is configured to dial *86, has not worked. It returns 'Your call cannot be completed as dialed, please check the number and try your call again.' AT&T was no help. I figured out that if I set my voicemail to my personal number, then it would recognize the call as a VM call and prompt for my pass code and work just fine.

However, after a period of time, I would find that the VM number was changed *back* to *86. Can anyone help with what is going on here and with how I can fix this? Either getting it to work with *86 or with how to get the VM number change to stick.

Thanks in advance...

 

[B. Diddy]

Re: Android 10/BV9900 Pro/AT&T: *86 not working and VM change won't stick

Welcome to Android Central! Does it usually revert to *86 after a reboot or complete power down?

Looks like at least some other people have seen this on other Blackview phone: https://www.techbone.net/blackview/a80-pro/voicemail-in-setup-keeps-reverting-to-86/3219

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