I was going to add this to another thread, but it was locked. I discovered a work around. (persistence was key here). Note that I am not an expert, and your mileage may vary. If the T-Mobile account is older than a couple years, the voicemail box (on T-Mobile's end) needs an update. In order to do this, the user needs to request that a T-Mobile rep reset their voicemail account. (completely reset back to new) The voicemail box then needs to be authorized for visual voicemail, which is done through the T-Mobile Visual Voicemail app. The user should not accept any of the extra services, as this will designate the Visual Voicemail app as the only usable external app for the T-Mobile voicemail service. Then the user must delete the T-Mobile visual voicemail app from their phone. This app blocks the voicemail user settings on android devices and cannot remain installed if the user wants to use stock or built-in voicemail services. The user can then restart their device and activate vi
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