Can't setup my voicemail system. Says I have an invalid number.

    donAs the title says, I can not setup my voicemail. It prompts me to hit pound and enter in my number or to enter in a ten digit number to send a message. When I enter in my own number to get started, it says that my number is invalid. I just signed on with T Mobile last month and this phone is new. I just want to get my voicemail setup and done with.

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