Samsung galaxy s5, unable to set up voicemail.


    I have an unlocked t-mobile Samsung galaxy s5. I've had it for almost a year now and have never been able to set up voice mail for it. This has become more of an issue to me recently and I need help figuring this out. When I call my voicemail, it asks me to enter my phone number. I enter it and then it says that my number is invalid. It then asks me the question again. This will just repeat every time I try to enter my number. Any ideas?

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