Reply by Lasse Langwadt Christensen●September 24, 20232023-09-24
søndag den 24. september 2023 kl. 01.34.21 UTC+2 skrev RichD:
> 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 network
> I know Qualcomm is a big player. I thought their CDM devices are
> inside the SIM chips.
The main chips that makes up the functionality of a cellphone
the SIM card is only a bit of encrypted data to identify you on
the network
the phone doesn't need a SIM card to make calls, you can call 911/112
without a SIM card
Reply by RichD●September 23, 20232023-09-23
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 network
I know Qualcomm is a big player. I thought their CDM devices are
inside the SIM chips.
What exactly are they selling then?
--
Rich
Reply by Lasse Langwadt Christensen●September 23, 20232023-09-23
fredag den 22. september 2023 kl. 22.47.14 UTC+2 skrev RichD:
> 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...
no, it is only a bit of data to identify you on the network
Reply by RichD●September 22, 20232023-09-22
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...
--
Rich
Reply by Martin Brown●September 17, 20232023-09-17
On 17/09/2023 15:43, Michael Terrell wrote:
> On Thursday, September 14, 2023 at 1:58:07 PM UTC-4, RichD wrote:
>> 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 -
>>
>> --
>> Rich
> 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.
--
Martin Brown
Reply by Michael Terrell●September 17, 20232023-09-17
On Thursday, September 14, 2023 at 1:58:07 PM UTC-4, RichD wrote:
> 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 -
>
> --
> Rich
You can buy a USB adapter, that comes with software to read the content.
Reply by Lasse Langwadt Christensen●September 14, 20232023-09-14
torsdag den 14. september 2023 kl. 19.58.07 UTC+2 skrev RichD:
> 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.
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