How-To Geek

Strip an RFID Card and Stash The Antenna In Your Cellphone Case

This clever hack involves stripping the RFID antenna and chip out of a transit card and stashing it in the back of a cellphone case–effectively turning your phone into an on-the-go transit pass.

It’s a clever way to cut down on the number of things you carry and keep RFID identification/travel cards with at your finger tips. Hit up the link below for a detailed tutorial.

RFID iPhone [via Hack A Day]

Jason Fitzpatrick is a warranty-voiding DIYer who spends his days cracking opening cases and wrestling with code so you don't have to. If it can be modded, optimized, repurposed, or torn apart for fun he's interested (and probably already at the workbench taking it apart). You can follow him on if you'd like.

  • Published 07/20/12

Comments (11)

  1. r

    looks like a good way to void any warranty for the phone.
    Also, I bought the mini-screwdriver that they sell for $9.95 at a dollar store…for a dollar….plus tax

  2. JL

    Somehow I believe this would make my phone’s NFC chip go nuts (since my city’s transit cards trigger the NFC chip on my Galaxy Nexus)

  3. natefrogg

    i wonder how it would go down when transit police do a ticket check on the train car, telling all passengers to get their tickets out and scanning them, of course your phone would scan well enough but you may find yourself delayed a bit with some explaining to do! otherwise, this is a very cool and efficient way to handle the transit pass

  4. Dark Reality

    This might void the warranty of the iPhone, but a real smartphone that lets you remove the back to get at the battery won’t be a problem.

    If you have a phone where you can’t open the casing, you could just affix it to the actual back of the phone if you have a case (e.g. an Otterbox). You might even be able to stick the whole RFID card in there, so you don’t have to break the card. I’m thinking of those RFID keys some businesses give their employees. Rather than get a belt zip clip, you could just stash it between the back of your phone and your case, and swipe in the door with your phone. You’ll also look really cool doing it. Tempting to try it, but my case is a real PITA to get off. I’m sure there’s a trick and I’m just dense…

  5. TBOD


  6. sill3

    An Iphone is a real smartphone & you can remove its back, replace the battery or anything if you like, but this will clearly void the warranty.

  7. Poet

    Hacking voids a warranty. If you worry about it don’t do it. DIY is a choice some make and other just buy stuff.

  8. Elis12


    I wouldn’t hack my smartphone not because I worry about it, but because it’s just a stupid thing to do if it voids the warranty. Hacking is fine, but I also like to make intelligent choices when I buy stuff.

  9. Dorothy

    Orwell would be proud!

  10. The Wizard of Oz

    what would Orwell be proud of, hacking cellphones ?

  11. Rabi

    great one, ive been looking for such a thing since a long time….

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