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 update the software of my Nokia Asha or Series 40 phone without a computer?
- How do I resolve the “conflicting applications” error when starting one of my preinstalled applications?
- How can I recover/reset/restore my phone software?
- I cannot send or receive email
- I cannot hear through my headset