Q: Not being able to play voicemail messages

Hello there, Jennib83.

The following Knowledge Base articles provide some good steps for pinpointing and troubleshooting your issue. Initially use the following to rule out the Phone app:

iOS: Understanding multitasking

http://support.apple.com/kb/ht4211

Specifically:

Additional Information

If an app doesn't respond to your input, or doesn't perform as expected, do the following, testing after each step:

1. Check for app updates.
2. Force the app to close.
3. Restart your device.
4. Update your iOS device.

If the issue persists, then use the following article:

iPhone: Troubleshooting voicemail

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

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.