Mobile Device Security
The "Find My iPhone" app is highly encouraged by Apple when first setting up a new iPhone or iPad. This is a great free service that not only locates the device, it allows for remote data wipe (erase of all data on the phone without actually having the phone in hand). The catch is that this app is required to be setup before a phone is lost or stolen as a pro-active measure.
Always a big concern is the data that is stored on the phone and/or the account information that the phone is attached to (such as a work e-mail account). It is vitally important that all smart phones have some sort of password/pin associated to help reduce the possibility of data breach.