Check if there is new software available for your phone. Lumia Amber update brings support for compressed WAV files.
- Why does my Lumia only show phone number of caller or SMS sender, although the contact name is listed in People hub?
- How do I configure my number to be private when I call someone on my Lumia phone?
- How can I divert incoming calls on my Nokia Lumia phone?
- How do I undo my Lumia phone association with a Microsoft Account?
- Why can I not sign in to my Microsoft account on my Lumia phone?