Contact your network operator. Your network operator can provide the unlock code and instructions on how to use it.
- I cannot connect to WLAN (WiFi) access point with my Lumia phone. What can I do?
- What is the Ringtone Maker application on my Nokia Lumia device?
- Why does my Lumia only show phone number of caller or SMS sender, although the contact name is listed in People hub?
- Which version of Windows Phone does my Lumia have?
- Can I print messages and documents from my Lumia phone?