What Else Can Your SIM Card Do?
July 4, 2007 by Jayvee Fernandez
Filed under Accessories, Services, Special Features
The definition of a SIM Card from Wikipedia
A Subscriber Identity Module (SIM) is a removable smart card for mobile phones. SIM cards securely store the service-subscriber key used to identify a mobile phone. The SIM card allows users to change phones by simply removing the SIM card from one mobile phone and inserting it into another mobile phone.
SIM cards can do more than just store service keys. I just found out that they can be used to detect temperature levels in areas and have that reading sent to a main controller to monitor anomalies. The data is sent via mobile phone to warn people of huge changes in temperature such as having your office become too cold or monitoring hot zones.
Wow.
How does it really work?