I recently switched phone providers, replacing the SIM chip.
Which got me wondering an old wonderment: what's inside?
It's remarkable that the industry has standardized on a
single form factor and pin out. But I'm curious, what
is the separation of functions, between the chip and the
surrounding device? How to characterize it as a black box,
what exactly are the signals which flow across the pins?
Do any of those pins carry analog waveforms?
I figure this is a reasonable place to ask such a question -
I recently switched phone providers, replacing the SIM chip.You can buy a USB adapter, that comes with software to read the content.
Which got me wondering an old wonderment: what's inside?
It's remarkable that the industry has standardized on a
single form factor and pin out. But I'm curious, what
is the separation of functions, between the chip and the
surrounding device? How to characterize it as a black box,
what exactly are the signals which flow across the pins?
Do any of those pins carry analog waveforms?
I figure this is a reasonable place to ask such a question -
--
Rich
On Thursday, September 14, 2023 at 1:58:07 PM UTC-4, RichD wrote:
I recently switched phone providers, replacing the SIM chip.You can buy a USB adapter, that comes with software to read the content.
Which got me wondering an old wonderment: what's inside?
It's remarkable that the industry has standardized on a
single form factor and pin out. But I'm curious, what
is the separation of functions, between the chip and the
surrounding device? How to characterize it as a black box,
what exactly are the signals which flow across the pins?
Do any of those pins carry analog waveforms?
I figure this is a reasonable place to ask such a question -
--
Rich
It's remarkable that the industry has standardized on a
single form factor and pin out. But I'm curious, what
is the separation of functions, between the chip and the
surrounding device? How to characterize it as a black box,
what exactly are the signals which flow across the pins?
Do any of those pins carry analog waveforms?
You can buy a USB adapter, that comes with software to read the content.
Modern mobile phones also offer eSIMs with no physical card at all.
On September 17, Martin Brown wrote:
It's remarkable that the industry has standardized on a
single form factor and pin out. But I'm curious, what
is the separation of functions, between the chip and the
surrounding device? How to characterize it as a black box,
what exactly are the signals which flow across the pins?
Do any of those pins carry analog waveforms?
You can buy a USB adapter, that comes with software to read the content.
Modern mobile phones also offer eSIMs with no physical card at all.A SIM chip can be replaced by software? I thought they had
rf detectors inside, TDM, FDM, CDM...
You can buy a USB adapter, that comes with software to read the content.
Modern mobile phones also offer eSIMs with no physical card at all.
A SIM chip can be replaced by software? I thought they had
rf detectors inside, TDM, FDM, CDM...
no, it is only a bit of data to identify you on the network
On September 23, Lasse Langwadt Christensen wrote:
You can buy a USB adapter, that comes with software to read the content.
Modern mobile phones also offer eSIMs with no physical card at all.
A SIM chip can be replaced by software? I thought they had
rf detectors inside, TDM, FDM, CDM...
no, it is only a bit of data to identify you on the networkI know Qualcomm is a big player. I thought their CDM devices are
inside the SIM chips.
What exactly are they selling then?
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