It's in the upper right corner of the screen. Now, if you are prompted to type in your password when you are checking voicemail, you should enter the password you just set. When checking voicemail from your iPhone, usually you don't have to type in the password again because your iPhone has automatically sent the password to your carrier already.
.To delete multiple voicemails, press and hold the first voicemail message, then “More items.”Select “Delete” then check the “I understand” box > “Delete.”How to Access Voicemail on Android?

3. There are a few different ways to access your voicemail setup from your phone's keypad, and they might vary depending on your provider. One option involves pressing and holding 1 on the keypad.
To set up Visual Voicemail, tap Set Up Now. You’ll be prompted to enter and confirm a voicemail password. Next, you’ll have the option to choose the default voicemail greeting or record your own. If you want to record your own custom greeting, tap Custom. Once you’ve entered created your password and chosen your greeting, you’ll be able to receive voicemails and view them in the Phone app.