i don't think you can because Sprint doesn't offer a VVM App for download. it's preloaded bloatware only. a better solution is this anyway -
use Google Voice "LITE" for you Voicemail! VVM, FREE TRANSCRIPTION, listen to messages on PC (Chrome Extension), and much more! -
Set up or Remove Google voicemail for your mobile phone
Set Up Google voicemail on your phone
Google Voice Lite lets you set up Google voicemail for your mobile phone number. You'll have all your voicemail in one place, with transcriptions, access to your past voicemails, and voicemail sharing options.
https://support.google.com/voice/answer/165656?hl=en&ctx=cb&src=cb&cbid=-1sx3qhtutyt40&cbrank=0