Some mobile carriers have support for [visual voicemail](https://en.wikipedia.org/wiki/Visual_voicemail) (sometimes for an extra fee). It would be nice if it was possible to check visual voicemail from Plasma Mobile. The [visual voicemail protocol is standardized](https://www.gsma.com/newsroom/wp-content/uploads/2012/07/OMTP_VVM_Specification_1_3.pdf), and based on IMAP -- voice messages are treated like emails with the message as an attachment in the protocol.