Check that you have not turned off the sound from the application settings menu. Check that your device is not in silent mode.
- Why does my Lumia only show phone number of caller or SMS sender, although the contact name is listed in People hub?
- How can I ensure that I will not lose my Contacts information on my Lumia phone?
- How do I remove a mail account from my Lumia phone?
- I cannot send or receive text messages on my Lumia phone
- How do I configure my number to be private when I call someone on my Lumia phone?