What does the voicemail displayed on your phone do?

To put it simply, if you activate the voicemail function on your mobile phone, when you are unable to answer the call due to certain circumstances, the mobile phone will automatically receive the voicemail, so that the other party can leave you a message after hearing the prompt. And you will receive a text message telling you when and what number sent you a message, and then you can call the voicemail service number to listen.