Hard Reset Lumia 520, 925, 928, 720, 620, 820, 920 Windows Phone 8 Here is the Screen Shots on how to Hard reset nokia lumia Step 1 Step 2 Step 3

Is it possible to unlock one Nokia Lumia 520 from Swisscom?
IMEI number is: 358106056449278
Switzerland carriers
don't want to sell codes
any idea how to hack?