How to Remote Wipe an iPhone or iPad...
If you have an iPhone, iPad, or iPod, you can remotely wipe the device with the help of an excellent free service offered through iCloud called “Find My iPhone” (or Find My iPad, etc). This is perfect for situations where a lost device is long gone with no chance of recovery, because it erases anything that is personally identifying, be it emails, texts, contacts, apps, quite literally everything. If you don’t have this configured yet and you don’t know how to use it, set aside some time to learn, it only takes a few minutes.