Original topic:

Is my phone behaving similar to proximity cards?

(Topic created: 10-06-2021 05:41 AM)
userhUJAaLq7oQ
Asteroid
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Galaxy S20

Hello,

I need to understand this in order to use it in my work. 

I work with access control systems. One of the hardware I use is proximity card readers, which read both 13,56 MHz and 125 kHz cards.

Accidentally I put my Samsung S20 phone near the reader and my surprise was that the reader did some readings.

Then I have opened Notepad and put the phone near the reader again and I saw that reader have read several numbers. For example, I have just put my phone in the reader and this was read:

4029234184
3629474568
1516677640
3332058120
2247351560
1729290504
0046941192
0967781384

It was like I have placed 8 proximity cards but in this case, all are contained inside my phone.

Can anybody explain me how this is happening? Is there an application that is allowing the phone to act as proximity cards? numbers read are always different every time.

The number of cards read depends on how long I keep the phone near the reader.

Thanks in advance,

Jaime

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