You can hacktivate a device by jailbreaking it with redsn0w and/or creating custom firmware files using tools like sn0wbreeze or redsn0w on an iPhone 4, iPhone 3GS, or iPhone 3G.
Due to increased thefts of smartphones, Apple company introduced security system with that you can lock your iPhone if you lose or you a steal. How to Bypass iCloud Activation all IOS all device How To Bypass iCloud Activation Iphone How To Bypass iCloud Activation on your Iphone.