If youre nimble enough, you can get past the Galaxy Note 2s lock screen. Attack relies on placing bogus emergency calls and running apps and dial numbers on phones even if they are locked with a pattern lock, PIN, password, or face unlock. This is a low-level threat, given that an attacker can only put through a call on a targeted Galaxy if it has a direct dial widget on the home screen. With regards to getting a response from Samsung, the company has restricted its bug bounty program to TVs.”]
Source: https://nakedsecurity.sophos.com/2013/03/05/samsung-galaxy-vulnerability/