I kept forgetting my building access card on my lunch break... I decided to do something about it.
Although there are cases with credit card storage, I prefer LifeProof cases for their water resistance and the shock resistance.
I peeled apart my key card and remove the coil inside. I attached the coil assembly to some plastic (from a plastic bag) with scotch tape (so not to scratch the back of the iPhone). I used rubbing alcohol and patience to ensure the coil was not damaged while I was peeling the card apart.
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The coil assembly was then placed under the back of the iPhone case cover.
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Even though there are multiple ridges, they did not affect the key card or the case (it has been going strong for over a year).
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The coil assembly could also have been installed behind the iPhones glass, as others have done:
https://www.adafruit.com/blog/2012/07/16/how-to-embed-a-rfid-transit-card-in-your-iphone/
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