Logo on Ericsson W800i

"J. David Anderson" <jdavidanderson_@hotmail> wrote in message
news:[email protected]...
| How could a sim, something that can be used in any model or type of
| cellphone, interact with the various operating systems and hardware that
| it could potentially encounter and still replace a specific function on
| a specific phone? I would be more inclined to agree that it would be in
| the phone's firmware.
|
Actually, the SIM can change the behaviour of a phone. Sort of, anyway. The
firmware in the phone must support such modifications though.
I once tried a vodafone SIM in my totally unbranded phone many years ago,
and suddenly, a new "Vodafone" menu appeared in the menu tree. It
disappeared when I restored my own SIM from another operator. I suppose
there is a "Customisable" menu item hidden in the menus by the firmware,
which is up to the SIM card to populate. In newer phones with graphical
displays, this functionality may very well have been improved to include new
images and graphics, as the memory size on the SIM has increased too.


--
/Danne
__________________________________________
d a n (dot) a l t e m y r (at) t e l i a (dot) c o m

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› See More: Logo on Ericsson W800i

Dan Altemyr wrote:

> Actually, the SIM can change the behaviour of a phone. Sort
> of, anyway. The firmware in the phone must support such
> modifications though. I once tried a vodafone SIM in my
> totally unbranded phone many years ago, and suddenly, a new
> "Vodafone" menu appeared in the menu tree. It disappeared when
> I restored my own SIM from another operator. I suppose there
> is a "Customisable" menu item hidden in the menus by the
> firmware, which is up to the SIM card to populate.

It's not that simple. There's no vacant menu items in firmware
just waiting to have values plugged in. To quote again from
GSM 11.14:

"A set of possible menu entries is supplied by the SIM in a
proactive SIM command. The menu selection mechanism is used to
transfer the SIM application menu item which has been selected
by the user to the SIM. The menu selection mechanism may also
be used for requesting help information on the items of the SIM
application menu."

> In newer phones with graphical displays, this functionality
> may very well have been improved to include new images and
> graphics, as the memory size on the SIM has increased too.

And a more general quote (trimmed by me) on capabilities:

"Proactive SIM gives a mechanism whereby the SIM can initiate
actions to be taken by the ME. These actions include:
- displaying text from the SIM to the ME;
- sending a short message;
- setting up a voice call to a number held by the SIM;
- setting up a data call to a number and bearer capabilities
held by the SIM;
- sending a SS control or USSD string;
- playing tone in earpiece;
- initiating a dialogue with the user;
- providing local information from the ME to the SIM;
- managing timers running physically in the ME;
- sending DTMF;
- requesting the ME to launch the browser corresponding to a
URL. (if class "c" is supported)"

Enough said?

John