You can change your voicemail password from your iPhone by calling (800)-922-0204. You’ll reach an automated customer service menu which will allow you to change your voicemail password. To learn more, check out Verizon’s support article on the topic.
If you miss a call and the caller leaves a message, it'll show up in the visual voicemail. Tap the message to listen and read a transcription (which may not be the most accurate).

The importance of voicemail in the customer care sector has not diminished despite the arrival of newer web technologies. VoIP applications let the businesses use voicemail service with flexibility, as it is. The users need not rely on extension terminals when they use VoIP services. A strong internet connection is a prerequisite and the pre-configured phones can be used – both for calling /receiving calls and for automated custom greetings. IVR feature redirect callers to the right virtual extension where their needs can be addressed. This can be done anywhere through a web portal access and an internet connection.
Most people screen their phone calls and often avoid answering unknown numbers. If you’re applying for new positions, you should try to view each unexpected call as an exciting opportunity! In the event that you simply can’t pick up the phone, you’ll want a polished voicemail greeting to let the caller know they’ve reached the right person.