Also, carriers have a limit to how long they'll let you record a voice mail. Test it with your phone and a friend before you trust this method.
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I have the same problem. I’ve also worked with the support line (via the chat option), and have been unsuccessful at getting it set up or enabled. “The voicemail box number is invalid…”, yet, if I call my number, I can leave a voicemail, but have no way to go in and retrieve it.
However, there are a few different “types” of a voicemail that you may be able to have on your device. One is a Visual Voicemail and the other is just a standard voicemail that you had on your landline a few years ago. Visual voicemail lets you physically see and play all of the voicemails, while regular is just done through the following audio prompts to hear your voicemails. Visual Voicemail is only offered throughout certain providers (and some might make you pat extra), so there is no guarantee that you will have it on your device.