I have a Galaxy S5 phone. I set up my voicemail account when I got the phone and it had been working fine. Late last week, something strange happened. When someone calls and I can't answer the phone they are prompted to enter a voicemailbox number. When I realized there was a problem, I called my voicemail using both *86 and by pressing and holding 1 on the dial pad. Each time I was asked for the voicemailbox number or press # to access my voicemail account. After pressing #, I am asked to enter my voicemailbox number. I enter my 10 digit phone number and am told that this is not a valid number. I try by passcode and that does not work either. Now, no one can leave me a message and, even if they did, I cannot access the message. I have tried rebooting my device with no luck either. Any suggestions out there?