Q: lost visual voicemail after updating i4s to iOS 7.1.1. anybody know why?

Hello hunterloette,

Thanks for using Apple Support Communities.

To troubleshoot the issue of your visual voicemail not functioning correctly, please follow the troubleshooting steps below:

1. Restart your iPhone.
2. Check for a carrier settings update.
3. Update your iPhone to the latest version of iOS.
4. Make sure that your voice mailbox is set up properly. You can verify this by dialing your phone number from your iPhone.
5. Make sure that you have a good cellular network connection. You can verify this by seeing whether you can make an outgoing call.
6. Call your iPhone from another phone and try to leave yourself a voicemail.
7. Reset your network settings by tapping Settings > General > Reset > Reset Network Settings.
8. Contact your carrier and make sure your iPhone is properly configured with the voicemail feature on your plan.

iPhone: Troubleshooting voicemail

http://support.apple.com/kb/TS4430

Take care,

Alex H.