It looks like Samsung copied nearly everything from Apple's iPhone... except the ability to secure your phone!
http://www.bgr.com/2011/09/30/major-security-flaw-lets-anyone-bypass-att-samsung-galaxy-s-ii-security-video/
http://www.bgr.com/2011/09/30/major-security-flaw-lets-anyone-bypass-att-samsung-galaxy-s-ii-security-video/