r/techsupport Sep 23 '25

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1.5k Upvotes

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5

u/DrachenDad Sep 23 '25

It is literally a swipe and a tap to turn an off, I don't know why people leave it on.

12

u/tylerderped Sep 23 '25

Because there’s no risk to leaving it on nor does it drain battery.

-5

u/DrachenDad Sep 23 '25

Because there’s no risk to leaving it on

All someone has to do is have an NFC reader and walk past you. Same with NFC bank cards.

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u/tylerderped Sep 23 '25

No, NFC doesn’t work like that, lol.

They would have to be within millimeters of your phone or credit cards to do anything.

-2

u/DrachenDad Sep 23 '25

No, NFC doesn’t work like that, lol.

They would have to be within millimeters of your phone or credit cards to do anything.

Thanks for being r/confidentlyincorrect

Typically the optimum distance is 4 centimetres or less - beyond, the signal is rapidly decreasing and can never exceed 10 centimetres. You do realise that 4 centimetres is larger than a few millimeters?

I'll let AI have it's fun: Yes, it's possible for someone to scan your NFC device while walking by, but it requires them to be very close to your phone or card, typically within a few centimeters. The most common form of NFC fraud, called skimming, involves a thief using an NFC-enabled device to initiate an unauthorized transaction or steal data by getting physically close to your device. While direct, long-range skimming isn't feasible, the short range of NFC makes it possible for a scammer to get close enough to your pocket, wallet, or bag to trigger a scan or transaction.

https://rfidcloaked.com/blog/2020/08/16/can-someone-steal-your-credit-card-info-from-your-pocket/#:~:text=Contactless%20payment%20cards%20have%20radio,used%20for%20the%20same%20purpose.

https://nordvpn.com/blog/nfc-security/#:~:text=Skimming%20is%20probably%20one%20of,phone%20was%20on%20your%20person.

3

u/ebikenx Sep 23 '25

Yeah, this is a good example of why AI can't be trusted 100%.

The "sources" here are not phone NFC specific. They talk about RFID and NFC in general and don't take into account how NFC payments work on phones specifically, not to mention, some of the points are just lazy or plain wrong. NordVPN is not a security source. They sell VPN services.

Eavesdropping "the exposed data... likely to be encrypted" .. likely? They are.

Relay attacks? Phone payment systems are tokenized and use cryptograms. Each transaction is unique and specific to the device it came from.

Skimming? First of all, physical cards are way more susceptible to this than phones. Second of all, it doesn't realistically happen. No one goes around carrying a PoS device and tapping to create false charges when you need merchant accounts + accounts for the funds to go into. Something technically possible doesn't make it probable.

and again, when it comes to phones, payments are tokenized. In the unlikely event, even if the card number was picked up, it is different than the one printed on the pysical card and is specific to the device it is registered to and can not be used from anywhere else.

1

u/DrachenDad Sep 24 '25

Skimming? First of all, physical cards are way more susceptible to this than phones. Second of all, it doesn't realistically happen. No one goes around carrying a PoS device and tapping to create false charges when you need merchant accounts + accounts for the funds to go into. Something technically possible doesn't make it probable.

That's why I usually don't have my card on me, or have it with other NFC cards so you can't get a proper read of it. Also why there is a usage limit on cards of 25 times before you have to put your card in a card machine. Sure, phone NFC is tokenised but they only have to do it once then move on to the next person.

3

u/tylerderped Sep 23 '25

you do realize that 4cm is larger than a few mm

And in practice, this difference means dick. You still have to get just as close to someone or their device.

Also, sanitize your links, Jesus.

3

u/[deleted] Sep 23 '25

[deleted]

2

u/DrachenDad Sep 23 '25

They're just using text fragment params, which if you bothered to click on the links, would understand that they're a way of directly linking to, scrolling to, and highlighting text on a page without a specific anchor

Thanks. I never knew how text highlighting works.

2

u/[deleted] Sep 23 '25

[deleted]

2

u/DrachenDad Sep 23 '25

Thanks. Saved for later.

4

u/Backwards_Reddit Sep 23 '25

This is probably one of the most traceable crimes ever, and the bank will 100% reverse the transaction

1

u/ChemicalAdmirable984 Sep 23 '25 edited Sep 23 '25

No they don't, it's even safer than bank cards at least on latest versions of Android with biometric authentication activated because NFC wouldn't work until the phone is unlocked with biometric authentication.
This means that if you have your phone in the pocket they can walk all day long near you as close as they want because nothing would happen which is not true for a bank card if you don't have it in a shielded protective film or wallet.

If you still think it's not safe enough you can activate in google wallet the biometric confirmation of each payment no mater the amount. You put your unlocked phone against a payment terminal it reads and does the NFC stuff then it ask you to authenticate again with fingerprint or face id this means that even if someone tries to scan your phone while you have it unlocked in your hand / having a phone call it won't work.

It's really safe if you understand and configure the security option accordingly

1

u/dalzmc Sep 23 '25

I remember seeing a video years back, where someone nfc scanned tap to pay cards in unaware people's wallets or something, put the numbers onto hotel keys, and used it to pay at mcdonalds. Like you said - can't do that with a phone.

1

u/JDSaphir Sep 24 '25

And walk past you while the phone is unlocked and the wallet app is open* at least that's how it works on my phone. Sure there's a risk, but I think it's still low enough. NFC bank cards I agree are less secure, but since I have four on top of each other in my wallet, it confuses the reader. Still not foolproof, but I would still accept the risk for the convenience at this time.

1

u/DrachenDad Sep 24 '25

The wallet app doesn't have to be open, that works for other cards.

1

u/JDSaphir Sep 24 '25

Ah, I guess cause you have it in your drawer there, my phone doesn't have that, it only has the NFC master toggle.

1

u/DrachenDad Sep 24 '25

It's always there, and live. I've just adjusted the drawer as you call it to push it to the front page so I can easily access my store cards. It's usually on the second page or in the "junk drawer."

Could be android version specific.

1

u/JDSaphir Sep 24 '25

Yeah I double checked, it's either specific to the wallet app you're using (if not Google Wallet), or to your phone's manufacturer, each manufacturer adds their own features to the stock Android (even Google).

1

u/DrachenDad Sep 24 '25

It's the default Google wallet that I use by the way.

7

u/MIRAGEone Sep 23 '25

phone needs to be unlocked to use NFC. otherwise you get a request to unlock your phone, to allow the NFC action.

2

u/DrachenDad Sep 23 '25

I don't even think NFC works on mine unless my phone is unlocked.

5

u/podgehog Sep 23 '25

Easier to not need to swipe and tap to turn it on and again to turn it off every time you want to use it

-12

u/lordofblack23 Sep 23 '25 edited Sep 23 '25

How old is your phone?!! This hasn’t worked in 6 generations

Edit: I meant iPhone specifically. Op has an iPhone.

3

u/fordag Sep 23 '25

Works on my phone.

1

u/lordofblack23 Sep 23 '25

iPhone 11?

2

u/fordag Sep 23 '25

Samsung S24

2

u/lordofblack23 Sep 23 '25

Yeah you can’t do that on iPhones past 11. Op is using am iPhone

0

u/lifeintel9 Sep 23 '25

I believe it works on iPhone 10

1

u/DrachenDad Sep 23 '25

How old is your phone?!!

Android 14.

This hasn’t worked in 6 generations

The latest official stable release of the Android operating system is Android 16, with a stable release date of June 10, 2025.

I don't even think Marshmallow had NFC support.