Make sure that your phone is running the latest software. You can find out more about the software changes for Lumia phones from here.
- Will I get “Hey Cortana” voice activation after Lumia Denim update?
- Is Microsoft account required for my Lumia phone to work?
- How do I switch my Lumia calendar views between 12- and 24-time format?
- How can I transfer my contacts, messages, calendar entries or photos to my Lumia?
- What is a Microsoft Account?