This is just a quick tutorial on how to track your iDevice using MobileMe – Find my iPhone
Go to the “Mail, Contacts, Calendars” page from your iPhone’s settings
Tap the “Add Account...” button
Choose “mobile me”
Enter your details or create a new account.
Switch “Find My iPhone” on, and you are done setting up!
Now, lose your iPhone, and use a web browser to go to me.com. Here's the page you'd get, just log on using your details from the previous steps.
Your alternative is getting the free app "Find My iPhone" from the Appstore and this is the login screen you will see:
It will take a few seconds to locate your phone and then display it, depending on your connection I guess (less than a second on mine). You'd get something like this with your device's name, and location on the map.
Click the blue arrow next to your device's name to view the action's menu as shown below:
You can display a message and/or sound, lock the device, or wipe the device data.
Let's send a message:
Type it and check or uncheck the sound option then click send. Note that it doesn't matter whether the phone is on silent mode, the "alarm" is going to sound.
As soon as the message has been received by your phone, you will be notified, and a confirmation email will be sent to you as well. Here's the email:
This is what the message looks like on my phone:
The other two options: lock and wipe, I am not going to demonstrate, because lock does exactly that, normally locks the device with the passcode, so if the thief stole your phone while it was unlocked he/she can't do anything with it anymore. Also I'm not gonna wipe my phone to demonstrate, use that only if you've lost hope of getting your phone back (and its not backed up on your iTunes) or if you've got really sensitive data on it.
Best case scenario of course is you don't have to use this application. So take care off your device, but better safe than sorry. Also avoid getting yourself in trouble by tracking wrongly, check these tips out.
Have a good day or night, wherever you are, whoever you are.
Its been a pleasure.