I have been with public mobile for a few years and stsring having this problem last week. Also when I try someone else's phone there is no trouble calling my number and when I try to call back I just get the message "6UM1"
Ok, so I reset my phone and no fix. But I added 1 infront of the number and it works. But I never had to do this before as they are local numbers. As for my voice-mail, when some calls me it only rings and doesn't go to voice-mail.