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TAP Card Dissolved! How to Use Acetone to Transfer an RFID Tag to Your Phone

Jul 20, 2012 04:24 PM
Jul 20, 2012 04:26 PM
Battery component with connector on a yellow backing next to a smartphone's disassembled battery compartment.

RFID cards are becoming a fairly common way to purchase goods, but they're already widely used to pay fares on buses, trains, subways, and trolleys across various cities. TAP cards are quick and reliable, but it can be a real pain to remember to bring them with you, especially if you weren't planning on using public transportation that day.

Hand holding a contactless payment card near a card reader.

Luckily, an intrepid tinkerer at Adafruit has managed to find a way to embed an RFID card into her phone, something you're far less likely to leave at home.

It's a little more elaborate than just cutting your card to size and sticking it in your device, but it's not a terribly difficult process. Unlike cutting the chip out, you're going one step further and dissolving the entire card, which leaves both the RFID chip and antenna intact. The video instructions are below, but if you'd like to follow along with it, check out the steps following.

Remove the RFID Antenna

To do this, you're going to dissolve the card in acetone. Acetone is a naturally occurring substance (although it is also artificially produced) that is used in the making of certain plastics, fibers, drugs, and chemicals. However, in this instance, we're going to be using it to melt down some plastic. Acetone is not particularly dangerous, but it can cause irritation and nausea if touched or ingested, so as you would when handling any chemical, take care.

To begin, place the card in the container that we will be pouring the acetone into. A glass or metal vessel is preferable, as the acetone may dissolve certain plastics.

TAP Card Dissolved! How to Use Acetone to Transfer an RFID Tag to Your Phone

Fill the container with acetone until the card is submerged, then cover it to help prevent evaporation.

Retrieve the Antenna

Once the plastic has dissolved enough, go through the pieces until you find the RFID antenna. The antenna is shiny and made of enamel-coated wire. It does not have to stay in the "card" shape to work properly, but be careful not to break it.

Close-up of hands holding a small electronic component on a wooden surface.

Embed the Antenna into Your Phone

Remove the back plate of your phone. There needs to be space in between the antenna and any metal objects in the phone in order for the reader to scan it correctly. To accomplish this, tape the antenna to a piece of paper, then continue taping over it until you have built up a thin layer. Then, lay the antenna over the contents of the phone.

Smartphone repair tool with a suction cup and disassembled phone components in the background.

Try It Out

Replace the back plate and give your new phone-card a try.

Smartphone battery replacement kit with adhesive strip.

If it does not work, experiment with how many layers of tape you are using and the placement on the antenna within the phone.

The next big software update for iPhone is coming sometime in April and will include a Food section in Apple News+, an easy-to-miss new Ambient Music app, Priority Notifications thanks to Apple Intelligence, and updates to apps like Mail, Photos, Podcasts, and Safari. See what else is coming to your iPhone with the iOS 18.4 update.

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