If you use an RFID card for your transit pass or ID card at work you can embed that card right into your phone so you don't have to carry it around. Electronics DIY web site Adafruit shows you how to do it.
The process requires you to dissolve the card in acetone so only the RFID antenna remains. When the card is dissolved you wrap the chip and antenna in a few layers of packing tape, fit in snuggly inside your phone, replace the back, and you're done. Adafruit's guide is for the iPhone, but you can likely use it for any smartphone you have. It could be handy for transit passes, but it might also be a great way to open your door. Head over to Adafruit for the full instructions.
RFID iPhone | Adafruit via Make
via Lifehacker http://lifehacker.com/5926996/embed-an-rfid-chip-inside-your-phone
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