Follow the instructions and press that number. You will be asked to delete your current Voicemail greeting. Click on the ‘Yes’ button that appears on the screen if you want to remove that. You can save your new recorded Voicemail greeting or can use the default recorded option. From the home screen, select the Phone app. Note: Alternately, you can set up voicemail by selecting the Phone app then selecting and holding the 1 key. Select Keypad, then select the Visual Voicemail icon. Select Start. Select Ok. From any Home screen, tap the Menu key. Tap Settings. Tap Call settings. Tap Voicemail. Tap Voicemail again. View the voicemail number. Press and hold the 1 on your device’s dial pad to call and connect to your voicemail. Press the star * key to access the main menu. Press 4 to access the mailbox options. Press 7 to change the language of the voicemail prompts to either Spanish or English.
Your iPhone does have a voicemail password, but you only have to enter it once and many new iPhones set it up automatically. However, there still needs to be some form of authentication between your carrier and your iPhone to download your voicemails. Even though you don’t see it, your voicemail password still exists.

From any Home screen, tap Applications.Scroll to and tap Visual Voicemail.Tap Greetings.Tap the greeting you want to use or tap Record a new greeting. To delete messages in bulk, select the menu bar in the top-right corner (represented by three vertical dots). Choose “Edit” and tap each individual voicemail that you wish to delete. The screen also includes a bulk select application for bulk deletion.
4. Turn on Autoplay. You don't have to press 1 to listen to messages if the Autoplay feature is on. To turn AutoPlay on or off: From the Main Menu, press 4 for Mailbox Settings.