Opening RFID Intercom with Samsung S21: Copy & Upload Key Fob Data to NFC Phone

Hello, is it possible to copy and upload data from an RFID keychain to a phone with NFC so that you can open it with your phone?
The phone is Samsung S21

https://www.elektroda.pl/rtvforum/topic3596128.html
https://www.zapmeta.com.pl/?locale=pl_PL&vid=...q=otwieranie%20drzwi%20telefonem&rkb=b&rkln=1

If these keyrings are Unique standard then no.
If in the Mifare standard, I was able to copy them on some phones.

How to check what standard they are?

Try to read them, e.g. with the TagInfo application. If it reads them, it will show that they are e.g. Mifare. If they're Unique, they won't be read... unless they're dual-mode.

active wrote:

How to check what standard they are?

If it's the intercom, there's a 99% chance it's Unique.

Thank you, and in that case is it possible to copy this keychain to something smaller that, for example, can be put under a phone case?

There are writable proximity cards, e.g.:
Programmable proximity card 125KHz T5577 UNIQUE

https://elektroweb.pl/rfidnfc/351-karta-zblizeniowa-zapisywalna-125khz-5904162802913.html

gkwiatkowski wrote:

There are writable proximity cards, e.g.:
Programmable proximity card 125KHz T5577 UNIQUE

There are also programmable RFID stickers. We have these glued to our phones
and then "from the phone" we open all doors that have systems operated by us.

Unfortunately, in the Unique standard it will be hard to find something completely flat, unless a sticker of about 3 mm thick is acceptable to you, then you have a link to such stickers below.
https://www.dafrfidtagsfactory.com/50mm-125kh...pvc-coin-cards-with-3m-glue-adhesive_p64.html
On the other hand, I don't know if it will be easy to buy something like this in retail, but that's another matter.
Another issue is whether it will be possible to find a place on the back of the phone so that the battery, NFC antenna, wireless charging or other metal elements inside the phone do not interfere with the operation of the RFID tag and vice versa, the tag does not interfere with, for example, the GSM antenna.

WojtekRav wrote:

sticker about 3 mm thick

Where did you read that on this site?
These stickers are 0.4mm thick, not 3mm

WojtekRav wrote:

Another issue is whether it will be possible to find a place on the back of the phone so that the battery, NFC antenna, wireless charging or other metal elements inside the phone do not interfere with the operation of the RFID tag and vice versa, the tag does not interfere with, for example, the GSM antenna.

We have glued on our S20 and it doesn't bother us at all.

@WojtekRav read something like this designed with 3MM sticker on the back and took as dimension 3 mm.

raffin wrote:

WojtekRav wrote:

sticker about 3 mm thick

Where did you read that on this site?
These stickers are 0.4mm thick, not 3mm

It just so happens that I just tested these and I have them with a total thickness of about 3 mm
They can be unglued and the PET base with the antenna itself will be about 0.4 mm, but in the place of the chip, the thickness is about 1.1 mm
The entire label consists of a foam layer with glue that allows it to be stuck even on uneven surfaces and that distances the chip antenna from any conductive surfaces, and a top layer of thick PET foil to protect the chip.

WojtekRav wrote:

and spacer antenna chip from any conductive surfaces

This is the essence.
Because the smartphone is a conductive surface.

gkwiatkowski wrote:

If these keyrings are Unique standard then no.
If in the Mifare standard, I was able to copy them on some phones.

Do you have any proven Mifare card emulator for your phone? or another way to identify the phone with one NFC ID?

mksolution wrote:

Do you have any proven Mifare card emulator for your phone? or another way to identify the phone with one NFC ID?

I use the simplest TagInfo and it works fine.
https://play.google.com/store/apps/details?id=com.nxp.taginfolite&hl=en&gl=US

I know this application but I don't see the card emulation in it. As in the subject, I am looking for an application that will allow you to open proximity locks with a phone, i.e. broadcasting a permanent (copied from a physical card) identifier via the phone in the Mifare standard.

I do not remember exactly. In one application I read the number of the original card, and the other application simulated the card with the given number.

mksolution wrote:

I know this application but I don't see the card emulation in it. As in the subject, I am looking for an application that will allow you to open proximity locks with a phone, i.e. broadcasting a permanent (copied from a physical card) identifier via the phone in the Mifare standard.

Ok I see. The given application is for identification only.

The iPhone way.

The intercom has an opening button. Instead of a button, you can insert a voltage-free controller replacing the button. Opening from a mobile phone, and after programming the NFC tag automation - opening by proximity.
I did this:
I ordered a 5-24V potential-free controller with Homekit upload: https://energodom.pl/sonoff-sv-5-24v-przekaznik-wifi-beznapieciowy-no-p-1044.html
I positioned myself according to the product instructions (tab on the website), plugged in the exit button (I didn't have an exit button in my intercom because it was unnecessary and I open it from the inside with the handle).
I added it to the Home application (HomeKit).
The power button in the application works properly. I added NFC tag automation in the shortcuts application. When the tag is detected, it selects the output switch from the Home application. It works in two ways: clicking the lock button in the home application or swiping the phone over the tag.

I replaced the MiFare key fobs with Apple AirTags. It is more expensive, but if it is lost, it is easy to find it or check where it is or who has it.


How to add NFC automation on iPhone (I'm posting it because this automation is not always visible, depending on the number of clicks)

NFC tag for HomeKit
Shortcuts app.
The Automation tab at the bottom of the Shortcuts app
New automation (+ at the top) Personal automation - select NFC from the list, start immediately (notify about launch as desired)
/ scan tag / name tag / OK / Next
When xxxx (name tag) detected - open the application
(important: magnifying glass and search bar at the bottom - enter house. The house icon will appear - click. Select control (My home) - click select the added lock opening controller (your name in HomeKit Home) / Next / enable option / APPROX.

I, on the other hand, having the same phone as the author of the topic, have a gateway station with RFID working at 13.56MHz. When trying to add the phone as a card a different card number is read every time.... Is the only solution for me is to buy a tag and stick it on the phone ?

You can also buy a UNIQUE RFID sticker and stick it to your phone .

UNIQUE has 125kHz...
I'm just wondering if with such a tag / sticker on my phone will e.g. contactless payments with my phone work, or do I have to stick the sticker somewhere on the side so it doesn't obstruct the NFC.

bynio1991 wrote:

I am just wondering whether, for example, contactless payments with such a tag/sticker on the phone will work or whether I need to stick the sticker somewhere on the side so that it does not obstruct NFC.

.

I've been using it for about a year now, different phones and no problems.