Put the person in your contact list and change their ring to mute. When they call your phone will not ring and they will go to voicemail. There are some paid applications where you can have certain numbers go directly to voicemail, but don't have any recommendations as have never used any of them.
Some carriers let you block a number from SMS messages but T-Mobile doesn't offer that. Again there might be some third party applications that will do this, check the app store for some options.
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need to send specific number to voicemail
