Here's how you can help Siri remind you on your iPod Touch to do things when you leave home or work. 1. Open the Contacts app. 2. Find yourself in Contacts. 3. Enter your home and work addresses. 4. Now Siri will be able to remind you to do errands and other things when you leave or arrive at either location.
For more, see the original article at the link below.
iPhone 5 Tips and Tricks | Apple