This service is free from Apple and if set up will locate any device with a few feet of where it is. I have 6 devices that I can track if I need to so far I have received a lost phone that by accident ended up in a friends car. I recommend ANYONE whom buys a i device or Apple computer set this up as you never know when you will need to locate a phone/ ipad /ipod or apple computer hope it helps regards colin
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FIND MY PHONE APP
If you misplace your iPhone, iPad, iPod touch, or Mac, the Find My iPhone app will let you use another iOS device to find it and protect your data. Simply install this free app on another iOS device, open it, and sign in with your Apple ID. Find My iPhone will help you locate your missing device on a map.You can then choose to display a message or play a sound, remotely lock your device, or erase your data on it.
Please note that Find My iPhone must be enabled in the iCloud settings on your device for you to locate it with this app.
FEATURES

• Locate your iPhone, iPad, iPod touch, or Mac on a map

• Display a message on the screen
• Play a sound for two minutes at full volume (even if your device is set to silent)

• Remotely lock your device

• Remotely wipe your device to erase your personal data

Supported languages: English, Japanese, French, German, Dutch, Italian, Spanish, Portuguese, Danish, Finnish, Norwegian, Swedish, Korean, Chinese, Russian, Polish, Turkish, Ukrainian, Arabic, Croatian, Czech, Greek, Hebrew, Romanian, Slovak, Thai, Indonesian, Malay, Catalan, Hungarian, Vietnamese
REQUIREMENTS:

• iOS 5 or OS X Lion v10.7.2 is required for iCloud users (iOS 3.1.3 or later is required for MobileMe users).
• iCloud account (available free with iOS 5 or OS X Lion) or MobileMe account is required.
• Internet connection is required. To be located, your iPad with Wi-Fi, iPod touch, or Mac must be connected via a registered Wi-Fi network. Your Mac must also be awake.
App Store - Find My iPhone