Mobile phones have become like personal computers that store a lot of private information but have significant security issues. Phones are often not properly patched and have multiple entities like manufacturers, carriers, users, and applications that each handle security with varying degrees of effectiveness. As phones gain more features like NFC and location services, they will likely face new risks from vulnerabilities, malware, and social engineering attacks. Strong passwords, encryption, and awareness of what applications can access are important for mobile security and privacy.