Check if there is new software available for your phone. Lumia Amber update brings support for compressed WAV files.
- I cannot send or receive text messages on my Lumia phone
- I cannot send or receive email
- How can I receive text messages from an iPhone when switching from iPhone to Lumia Windows Phone 8?
- How do I remove a mail account from my Lumia phone?
- How can I add special characters in "To:" field in the Messaging (SMS/MMS) app?