I recently purchased an iPhone 5s and my voicemail is not working. There is a solid red dot on the voicemail button and when I try to access my voicemail it says that i've reached the voicemail system and to press * if i have a mailbox already. When I press * it says sorry, that mailbox is invalid. I've tried resetting the network settings and restarting my phone but nothing seems to solve this issue.
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