On May 8, 7:57*pm, John Henderson <jhenRemoveT...@talk21.com> wrote:
> Mouse wrote:
> > Hi ALL,
>
> > Does anyone know if it is possible (by SMS'ing a GSM code type
> > arrangement) to change the diversion (forwarding) number on an
> > unattended mobile telephone. Do I have to have an application
> > on the phone to facilitate this? Any info/ideas would be
> > great.
>
> I seriously doubt it's possible, for security reasons alone.
>
> Another aspect is that the diversions are not held on the phone
> - they're part of your configuration data on the network
> itself. *For that reason, you may have noticed that you can't
> change diversions when there's no coverage.
>
> Changing diversions using the phone's menu system attempts an
> immediate "supplementary services" data session with the
> network. *So because networks have absolutely no requirement to
> modify diversion parameters on users handsets, I doubt that a
> specific GSM port number has been allocated to facilitate this.
> If it were possible, technical specification 3GPP 23.040 would
> provide the mechanism (section 9.2.3.24.3 or 9.2.3.24.4).
>
> John

Such a facility was available on Telstra's PSTN network, although
never used.
It involved dialling the Remote Control number on your home switch to
get an interactive IVR, which stepped you through the process of
changing Easycall settings on your home number remotely.

Such a thing has never been done on the Telstra GSM network.
You can however, call the Mobile helpdesk on 125111 and get them to
set/change diversions for you if you can prove you own the service you
want the diversions changed on. (for Telstra).

Good luck.