Question: How can I put voicemail on speaker?
I have an iPhone 5S. I can't find any way to put voicemail on speaker. I heard a rumor that it is possible to switch to speaker after selecting a message, but I can't figure out how to select a message. The voicemail icon has a "1" beside it, so I think there is a message in my voicemail, but all I get is a "call voicemail" button. When I do that, I can't hear the prompts without using the speaker, so I can't ever get to a message. How can I switch to speaker when calling voicemail? Thanks.
iPhone 5s, iOS 11.2.5