More cities are increasingly adopting the use of RFID in their transit cards, allowing commuters to tap their wallets on a reader to pay for their fares without swiping. That’s convenient enough as is, but one person decided to hack the idea to embed the RFID chip inside her phone.
Becky Stern dissolved her Boston transit pass, the CharlieCard, in acetone, leaving behind the RFID antenna and chip.
After some trial and error, she discovered that the chip scanned more reliably with some air space because of the proximity to metal. This was done by taping the RDID innards to a piece of paper.