Change Voicemail Provider on Samsung Galaxy S8

dreamspinner3

    How can I change my voicemail provider from T-Mobile to a voicemail provider of my choice?  I want to call my voicemail provider when I dial '1' or hit the voicemail button and NOT my T-Mobile Voicemail.  I have my phone set up to forward new calls to the voicemail provider I wish to use.  Thanks!

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