Make sure that your phone is running the latest software. You can find out more about the software changes for Lumia phones from here.
- How can I check the IMEI number of my Lumia phone?
- What can I do if the latest Lumia extras are missing on my phone?
- How do I select Lumia Camera as the default camera on Lumia phone?
- Why can I not find the option to 'show more tiles' on my Lumia?
- I cannot end a call because my Lumia screen remains black.