iphone New Security Feature

According to CrunchGear, the new iphone is going to have a security feature which requires users to enter a security code if the phone is removed from a specific area. If the code is not entered properly the battery will not be able to be recharged.

I know that this is wishful thinking but many schools claim that they don't want their students to bring cell phones to school because of the potential of burglary. Well, what if phone companies set up phones that required somebody to enter a code whenever the phone left the school?

What types of suggestions would our students have to prevent stolen phones from being able to work?