The smart phones are used worldwide due to their enhanced features, computing capabilities, increased storage capacity, attractive touch interface, and the ability to use the Wi-Fi signals. The smart phones have new uploaded features that make them more interesting. These include, sharing video and pictures via social network websites such as, Facebook and Twitter. Due to the large number of people using smart phones, there is a growing concern for electronic crimes. Therefore, the digital forensic of the smart phones has became an essential practice to forensic analyst and security specialists. Investigators found that smart phones are now a significant potential source of digital evidence in criminal investigations. The paper investigates different types of logical backup and encryption techniques used with the smart phones. Different smart phones were examined; examples of these are iPhone 3GS, BlackBerry Bold, and Samsung Omnia II I8000. The paper has also addressed the storage and location of social network data. © 2011 IEEE.