Anyone know how to write network games on mobile

anyone knows how to write a network game on GSM mobile? How to communicate between several mobile phones? is there any document talking about it ?
thank you for your answering

Network gaming on mobiles is VERY limited.
You have the choice between the following:
* IRDA
Slow, bitchy, LOS connections, if even supported out of java
* WAP
Kinda like the webgames but like any internet connection you pay for traffic.
But the pro part is that like webgames the images are sent from the server so the clients do not need to install anything. But not really a pro because that causes traffic.
* Bluetooth
IMHO the only solution.
But not yet supported out of java by all devices.
Just google for Bluetooth and java.
(or go straight to nokia’s dev site and dwld the pdf docs)
also a good site:
http://www.benhui.net/

Just use GPRS and somekind of central server.