GSM to GSM device direct communication

[archeon]

Hi everyone, love the site :-)

Due to fortunate (and cheap) circumstances I am now the owner of two XDA/Wallaby/Qtek 1010 devices.

After much playing, I got to wondering if it was possible to modify these devices so they communicate directly with each other rather than using the existing (vodafone NZ) GSM network. I assume it would at least require modification of the radio stack ROM, if it is even possible. I guess the existing functions provided by the radio stack to the OS would be restricted to specific network related operations.

Does anyone have any further information about this, or modification of the radio stack? Also what are the risks? I understand that the wallaby is pretty resilient to permanant breakage through dodgy flash writes etc.

BTW if this sort of modification is illegal due to frequency licencing etc, then I am asking about this in a purely hypothetical sense :-)

[Rudegar]

as far as i know it's supported by all of gsm pda's
when one setup a connection
one pick cellline rather then grps
ppl who have an isp which dont use grps
use it that way
of cause for 2 devices it would require software to work
where one acted server and the other client
like the good old seriel cable connection between 2 pc's

[archeon]

whoops, I mean without any celluar network involvement at all, just device to device communication over the cell phone radio of the devices. Pretty strange idea I know, but would it be possible?

[Rudegar]

if they used the 900/1800/1900 Frequiencys it would be illegal as it would interupt other devices in the area from being able to reach their gsm antennas

[archeon]

hmm damn there goes that idea. Such potential for long range comms too!