Android phones are extremely practical devices, properly wielded: You can use them to cut the time required to do many tasks, such as checking and responding to your e-mail. But your phone's power could become a devastating weapon used against you if your handset is lost, stolen, or compromised by malware. Although you can avoid many problems by following basic security precautions, it's also wise to install an app like AVG Anti-Virus Free (Pro version $5). The AVG app provides continual, automatically updated protection against rapidly evolving Android security threats. It also offers some useful tools, such as data backup, remote phone tracking, and remote wipe.