So I work at a small family-owned furniture showroom, been here about two years doing floor sales. We do a decent amount of home expos and design fairs where we meet a ton of potential customers in a few hours, shake hands, chat about their living room situation, and then... hand them a paper card and hope for the best.

The problem is I have zero idea what happens after that. Do they call? Did they lose the card? Did someone else from my team already follow up with them? We have no real system. My manager keeps talking about getting our CRM act together but nobody actually knows what that means day to day.

I started looking into digital business card options because a coworker mentioned it but honestly I feel completely lost reading through all the product pages. A lot of them sound the same and I can't tell what actually matters for someone like me who just wants to stop dropping the ball on follow ups after events.

If you've figured out how to handle this kind of thing, especially for a small sales team that isn't super tech-savvy, I'd really appreciate some direction. What should I even be looking for?

I have a infinix gt 20 pro and it got nfc whenever i try to add a payment or metro card it doesn't let says payment cards aren't supported is there any fix ??

I may be late to the NFC sticker game, but I wanted a way to link any physical album to any streaming service.

The idea: NFC stickers with pre-embedded short links. You stick one on an album, assign it once, and the system finds that album across all the streaming services. Set it and forget it. From then on, tapping the sticker with your phone opens a link page where you're one click from the album — and there's a setting to skip the link page entirely and jump straight to your preferred service.

Full transparency: I built this myself and I think the system is working, but I need real people to kick the tires. I'd love to send free sample stickers to anyone willing to test it and tell me honestly whether this idea has legs. Mostly I'm hoping to find other people who love physical media but live in streaming apps, and see if there's a community here.

So my dad has this fidelity card from our town's Afriquia gaz station. You know the type — tap to pay, collect points, probably some basic NFC tag inside.

Out of curiosity, I scanned it with my phone and dumped the memory using NFC Tools.

Here’s what I got:

\`\`\`

Page 00: 04 AC 1F 3F

Page 01: 22 2B 2C 84

Page 02: A1 48 FF FF

Page 03: E1 10 06 0F

Page 04: 03 20 D1 01

Page 05: 1C 54 02 65

Page 06: 6E 30 41 71

Page 07: 4D 47 56 55

Page 08: 68 58 71 33

Page 09: 76 54 71 4C

Page 10: 2F 6E 47 54

Page 11: 51 58 64 41

Page 12: 3D 3D FE 00

\`\`\`

Looked like gibberish at first — but I noticed a base64-looking string at the end:

en0AqMGVUhXq3vTqL/nGTQXdA==

Decoded it to 18 bytes of binary:

7A 7D 00 A8 C1 95 52 15 EA DE F4 EA 2F F9 C6 4D 05 DD

Still nothing… until my dad mentioned he got the card on February 8, 2025 and it has a 10-year lifespan.

I checked the first 4 bytes as a Unix timestamp:

7A 7D 00 A8 → February 8, 2035 ✅

Then I looked at the last 2 bytes: 05 DD.

As big-endian hex, that’s 0x05DD = 1501 cents = 15.01 (Whatever currency it is stored as).

That’s literally his balance. Just sitting there. In plain sight. On an NFC tag. No encryption. No authentication.

Dont hesitate to correct me if I got something wrong 😁

Hello Im currently working on a uni project and i kind of need some help,

Im currently working on a small passive NFC prototype using a NXP NHS3152. The goal of the project is to keep the PCB as small and discreet as possible and only bieng powered only from a phone NFC field with the MCU taking a couple of low-power analog readings and sending a simple result back to the phone.

I would like some help with the power side before I go too far with the antenna and PCB layout.

The system would ideally run around 1.8 to 2.0 V when powered by the phone. The sensing load is expected to be fairly low, roughly in the range of a few µA up to maybe 60 to 70 µA depending on the resistor values used.

Rough power estimate would be at 1.8V, 5 µA = about 9 µW, 20 µA = about 36 µW, 65 µA = about 117 µW

and for 2V its would be, 5 µA = about 10 µW, 20 µA = about 40 µW, 65 µA = about 130 µW

I would only power the analog measurement section for less than a second so the average current should be lower than the active measurement current.

Main questions:

1. Is this kind of power budget realistic for a passive NFC tag powered by a smartphone?
2. For the NXP NHS3152, what is the best practical NFC antenna approach on a small custom PCB or if anyone has a NFC design for these specifications?

I’m not trying to transfer much data, just wake from the phone field, take simple readings, and send a small result back to the phone.

Any advice from people who have worked with passive NFC sensor tags, NHS3152/NTAG-style parts, or small NFC antennas would be appreciated!!!

Edit: Forgot to mention the Maximum Size of the Antenna is around 5.8cm × 5.8cm and its going to be printed on a flexible substrate.

Let’s share our NFC hacks!

Hey team. I am a bit new to NFC tags but I can see how helpful they can be.

Android - Samsung

NFC pro.

Google home

I want to tap the tag on the way out of the door, my robo vac starts, google tells me its begun cleaning and the front porch lights flash a few times. But I cant work out how to make this happen.

Can anyone help please.

Was at lunch at my local Panera and as I sat down I get a notification from my iPhone that a YouTube NFC tag is detected. I click on it and it redirects to a Rick Ashley video. WTF?

What’s the purpose of this? I assume there is there a physical device transmitting this. What for?

Hello, my company wants to distribute NFC tags around the facility to allow people to tap their phones and access a link. The link is slightly different for each room. (Don’t ask why they don’t just replace it with a QR code, I guess they just want to look cool)

So they tried using an NTAG215 but I was able to overwrite it with a flipper zero in almost no time. Even though they had the “read-only” feature turned on. So they’ve asked me to find an alternative tag that is impossible to overwrite, especially with a flipper zero.

Before ordering the tags, I did my research and NTAG215 was advertised as being able to be read-only. So now I lost trust in these claims, and I decided to come here and ask people with experience for help.

Does anybody make small, NFC compatible safes? We have a couple hair salons so we have a couple cash drawers to manage. We keep a small amount of cash on hand to restock the drawer when needed, and for cash drops. We use unifi access for our door access, and would love to be able to program the same unifi NFC fobs to the safe to give certain employees access to be able to restock the drawer. Any of y’all know of a solution that works? I’ve done some searching but haven’t found anything yet that I can be sure works.

معلش ي جماعه حد يعرف تستخدم ازاى يعنى انا عاوز اربط الاى دى وانا داخل الشغل بالموبايل و ادخل بيه من البوابه بس بيقولى دايما ابلكيشن غير مدعوم او اربطها بالڤيزا مثلا اى حاجه

I've been diving into NFC read/write using r/IOS. I have a robust r/qrcode addressing framework and from what I see, there is an analogous relationship between a QR code and an NFC tag. The difference is in how they are recognized: NFC uses a radio frequency, and QR uses an optical scanner (or internal image scanner). The result is usually just text and typically a URL.

Everything was going good until I tried a WIFI setup URL. Using the common WIFI:S:<ssid>;P:<pass> syntax I figured any reader would work as if reading a QR code. Well as noted here and elsewhere, Apple doesn't seem to recognize this syntax as a WIFI setup (but it does with QR codes). It was mentioned that maybe Android does work. I think that's a mistake for Apple, unless they thought of some strange security concern (vs QR code).

Of course a custom NFC reader could do the right thing with that syntax. But that's limiting.

I did come up with an approach where the WIFI syntax is wrapped in a base64 string and then passed as a parameter to a custom web service. That new web service URL is what I can write to the NFC tag. When that NFC tag is read, the resulting web page shows the decoded WIFI syntax (and a corresponding QR code). The user would still have to scan or touch that web page to join the WIFI network. It seems convoluted but it's the best I could come up with.

Has anyone else figured out a work around (aside from using a QR code)?

So my girlfriend walked in couple days back and as usual shes FULL of ideas.

Great!

She works in a tattoo shop as an artist but she also like to make keychains, earrings , bags etc.

She bought like 20 nfc tags and said, program these for me so people can just pay for the item with nfc.

Now im pretty tech savvy but i have no idea how or where to begin.

I dont even use NFC on my phone.

Is there some sort of rulebook on what to look out for? Or does it just work with an app?

Thanks for any help!

Hello everyone, I have built a full system for an idea of mine. Everything is coded and working wonderfully, but I have ran into a problem. I need to be able to make the user pay via apple pay but when I tap the phone to make the payment, the apple pay window opens but it doesnt let me make any payments. Is there a solution to this?, do I need a better NFC NTAG/Module for this to work?, if so which one do i need to get?. Thanks in advance.

Hello everyone, I have built a full system for an idea of mine. Everything is coded and working wonderfully, but I have ran into a problem. I need to be able to make the user pay via apple pay but when I tap the phone to make the payment, the apple pay window opens but it doesnt let me make any payments. Is there a solution to this?, do I need a better NFC NTAG/Module for this to work?, if so which one do i need to get?. Thanks in advance.

I got the Foqos app a few days ago and a couple of NFC tags on Amazon, but the tag doesn’t seem to work to block and unblock my apps unless I go into the app. I thought the app started automatically when I placed the tag against my phone (the tag is working) but it seems I first have to open the app, click on starting the session, and then it asks me to scan the tag. Same thing to end the task, I can’t just hold the same tag against my phone, I have to go into the app and I feel that defeats the purpose of the NFC options since I might as well start the session and end it manually.
Anyone has any experience with this, am I doing something wrong?