Maybe you want to try putting Folders on your Windows Phone homescreen, but you don’t want to pony up the £65 you would need for a Developer account. In that case you’ll be wanting to take a look at ChevronWP7, which allows you to unlock your Windows Phone.
Not SIM unlock, in case that’s what you were thinking. The Chevron unlock allows you to sideload apps onto your Windows Phone, as well as make some modifications, like the Folders mod or taking screenshots.
Best of all, Microsoft are totally on board: the developers have been working closely with them in order to bring this to the masses. You won’t void your warranty after unlocking either.
If you want to unlock your Windows Phone, you’ll need to head on over to the source link, have a Windows Live account ready, and be prepared to hand over $9 via PayPal. Sure, it’s not free unlike iPhone jailbreaks or Android roots, but it’s still a fraction of what you would have paid otherwise.