this post was submitted on 07 Jun 2026
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    [–] ExtremeDullard@piefed.social 456 points 1 week ago* (last edited 1 week ago) (27 children)

    I'll do one better:

    Reshaped payment card's NFC antenna

    My payment card was just a bit too wide to fit in my cellphone's cover. The phone's own NFC antenna is at the top - and I use it all the time - so the card had to be at the bottom of the cover to avoid triggering the phone all the time, in portrait orientation so-to-speak.

    So I dissolved the card in acetone to extract the NFC chip and its antenna, then carefully reshaped one end of the antenna so it's a bit less wide (and since I couldn't modify the length of the wire or the number of turns in any way to avoid de-tuning the antenna too much, I sort of accordioned one side of the rectangle to accommodate the extra length of wire).

    Then I set the new shape of the antenna permanently by carefully applying a piece of packing tape over it, flipped it over, taped over the other side to seal everything, then carefully cut around the new, ultra-thin, stubbier contactless payment "card".

    Now it fits really smartly in my cellphone cover!

    [–] SpaceNoodle@lemmy.world 210 points 1 week ago (1 children)

    Next time someone calls me a maniac, I'll show them this.

    [–] WhoIzDisIz@lemmy.today 27 points 1 week ago

    Definitely doesn't live up to their username.

    [–] flamingos@feddit.uk 121 points 1 week ago

    The fact it's secured with a piece of sellotape is just *chef's kiss*.

    [–] napkin2020@sh.itjust.works 68 points 1 week ago

    You are fucking crazy. I love you.

    [–] felsiq@piefed.zip 50 points 1 week ago

    >ExtremeDullard
    >most interesting post

    ???

    Peak Lemmy behaviour I love it

    [–] 87Six@lemmy.zip 37 points 1 week ago

    I just wanted to say your dad is definitely proud of you dude

    [–] gedfromgont@piefed.ca 30 points 1 week ago

    You just had to 1-up everyone here...

    [–] Pyron@feddit.org 26 points 1 week ago

    "Please use chip reader".....

    [–] OwOarchist@pawb.social 25 points 1 week ago (4 children)

    I dissolved the card in acetone to extract the NFC chip and its antenna,

    Wouldn't the acetone also dissolve the insulation around the antenna wire? So when it touches itself, it shorts itself out, and -- electrically speaking -- you only have one turn of thicker wire?

    [–] Darkassassin07@lemmy.ca 54 points 1 week ago

    Wire that thin is usually insulated with an enamel coating. I'd guess it's either unaffected by acetone, or just tougher to breakdown. Allow the card to dissolve, but remove and dry asap, don't let it linger longer than necessary.

    Veritasium demoed this a few weeks ago while discussing tap-to-pay security and a vulnerability with apple pay+visa.

    [–] Korhaka@sopuli.xyz 18 points 1 week ago (3 children)

    Only one way to find out, good thing that these don't cost any money and you can just ask for a new one.

    Maybe take some cash out first to cover any payments you may need to make it it breaks in some way.

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    [–] mexicancartel@lemmy.dbzer0.com 12 points 1 week ago* (last edited 1 week ago)

    Well if it dissolved any insulation, it will not work, as the coil isnt even coiling. It is not a one big coil buy just two ends shorted(or as in the picture, a very small coil. Since this works i can only conclude coating does not dissolve in acetone

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    [–] definitemaybe@lemmy.ca 15 points 1 week ago* (last edited 1 week ago) (1 children)

    Have you ever run into difficulty with needing to authenticate with chip+PIN? Like while traveling?

    That would be my big concern with this; it would make it very difficult to pass a PIN check, to say the least!

    Super cool idea. I might just try it myself and see if I run into issues.

    [–] ExtremeDullard@piefed.social 23 points 1 week ago (2 children)

    What I modified was in fact a contactless payment token. It had the form factor of a payment card, but it only does NFC.

    I have another card for chip+pin.But I almost never use it where I live, because all limits were lifted on contactless payments a few years ago. If I try to pay something really expensive contactless, it will ask me for the pin - which is specific to the payment token.

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    [–] newton@feddit.online 15 points 1 week ago

    Ty, great idea will try it

    [–] bacon_pdp@lemmy.world 14 points 1 week ago (2 children)

    I am surprised that no one sells cases designed for exactly this

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    [–] GreenShimada@lemmy.world 13 points 1 week ago

    I love this.

    Amazing, I have never thought of that! I have always carried my card behind the phone, which is a bit too thick for my liking, but this is such a great idea, thanks for sharing!

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    [–] artwork@lemmy.world 63 points 1 week ago* (last edited 1 week ago) (2 children)
    [–] flamingos@feddit.uk 39 points 1 week ago (1 children)
    [–] normis@infosec.pub 67 points 1 week ago (4 children)

    Screen side with call buttons

    [–] Darkassassin07@lemmy.ca 14 points 1 week ago (1 children)

    You could put the rubber bands in between the phone and the case, so it's not on top of the screen.

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    [–] flamingos@feddit.uk 11 points 1 week ago

    Ah, now I see it. Thanks!

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    [–] Hazel@piefed.blahaj.zone 7 points 1 week ago (7 children)

    Yeah just use glue, smh my head.

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    [–] NoSpotOfGround@lemmy.world 60 points 1 week ago* (last edited 1 week ago)

    Take that Android! This works even with the phone powered off! It works even without the phone at all!

    Wait...

    [–] stoy@lemmy.zip 57 points 1 week ago (3 children)

    Or you can just keep your card in your wallet, like you have done for decades

    [–] Phantaloons@piefed.zip 28 points 1 week ago

    The privileged have to invent their own problems.

    [–] JesusTheCarpenter@feddit.uk 19 points 1 week ago

    The problem is that I don't cary my wallet with me for pretty much a decade now.

    [–] makeshift0546@lemmy.today 11 points 1 week ago* (last edited 1 week ago) (5 children)

    Didn't have to carry a phone for decades.

    Now I don't have to carry a wallet and multiple cards πŸ€·β€β™‚οΈ

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    [–] diaphragmwp@discuss.tchncs.de 38 points 1 week ago (12 children)

    Ironic it's a monobank card, it's mobile only and you have to use a locked unrooted googled phone (or an iPhone) because big brother said so.

    [–] UkrainianBull@reddthat.com 34 points 1 week ago* (last edited 1 week ago) (2 children)

    Also this https://telegraf.ua/ukr/ukrayina/5935111-gorokhovskogo-chekae-pokarannya-yuristi-rozpovili-chim-dlya-monobank-zakinchitsya-skandal-z-oprilyudnennyam-foto-klientki

    TLDR: some woman did a facial recognition log in method, the bank said that the photos are not stored and deleted instantly, but because there was a Slovenian flag (looked like russian in the photo)in the background, she got her bank account blocked and the CEO posted the verification image online

    Edit: wrong link

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    [–] Zamboni_Driver@lemmy.ca 30 points 1 week ago (2 children)

    Now how about contactless payments without visa or MasterCard.

    [–] brucethemoose@lemmy.world 28 points 1 week ago* (last edited 1 week ago) (5 children)

    It would have been nice if crypto didn’t turn into a network of pyramid schemes.

    Like, I am sympathetic to the idea. I mined a Bitcoin a long time ago (and lost it in intervening years). But holy moly, did it erupt into a tire fire.

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    [–] PerogiBoi@lemmy.ca 14 points 1 week ago (5 children)

    Non American credit cards when

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    [–] UkrainianBull@reddthat.com 27 points 1 week ago (4 children)
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    [–] drmoose@lemmy.world 25 points 1 week ago (3 children)

    We can go even further and create some sort of physical tokens that we can give to each other. These token would be secure, completely private, waterproof and even work offline. Maybe we could even put some pictures on them and make them vision-impaired accessible - the possibilities are endless!

    People forget that cash is a technology - a pretty good one too.

    [–] Croquette@sh.itjust.works 8 points 1 week ago (1 children)

    Banks are closing ATMs left and right. It is getting increasingly harder to withdraw paper money and it sucks.

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    [–] user224@lemmy.sdf.org 24 points 1 week ago* (last edited 1 week ago) (2 children)

    Maybe a solution similar to this could work: https://github.com/nfcgate/nfcgate/blob/v2/doc/mode/Relay.md

    Have the card at home sitting on a reader connected to your homelab, add NFC module to PinePhone and simply relay the traffic over network.

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    [–] nefRrgar@lemmy.world 22 points 1 week ago (1 children)

    Works without connection tooπŸ”₯

    [–] GutterRat42@lemmy.world 24 points 1 week ago

    Contactless payment works without connection. Now, the technical marvel is that it works even if the phone is dead.

    [–] mEEGal@lemmy.world 22 points 1 week ago

    Nice meme, but for us out there with at least a fully virtual card (some companies provide such benefits), we need a real MyAss-Pay alternative

    I recently found Walt, but it's a work in progress for now. The app is avalaible though

    Some banks issue stickers for phones without NFC. It's another physical card but contactless only and very thin (probably with an aluminum strip antenna).

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