I just switched to T-Mobile from another provider and had this problem. What worked for me was I had to first setup my voicemail by calling the voicemail number the old fashioned way. This number was already in my contacts. Once that was setup the visual voicemail worked fine. And no, you don’t need the T-Mobile app, you can use the default one on your phone.A lot of people saying clearing the app’s cache worked too. To do this on an Android, go to the individual settings of the voicemail app, click on Storage, and on the bottom are options to Clear Cache and Clear Data.
Already have an account? Login
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.
Sorry, we're still checking this file's contents to make sure it's safe to download. Please try again in a few minutes.
Sorry, our virus scanner detected that this file isn't safe to download.