Voicemail says number is invalid


    I have tried everything to set up and to gain access to my voicemail on my iphone SE. I looked up answers, links, and even chatted with a representative online. However they tell me the same things the internet has but nothing works. I call my voicemail, it says if I have a voicemail system press star or to leave a message with someone dial their number. I pressed star and the person told me to enter my 10 digit phone number but when I did it says it is invalid

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