“Toonel.net” is a free cross-platform open source software that gives you the possibility to lower your gprs-costs and increase speed of data transfer. The program works under Windows, Linux, Mac OS, Symbian OS, Windows Mobile and some others platforms and can compress the user traffic up to 50%.
P.S. On the screenshot you can see Pocket PC-version of the Toonel.net-Software, but without any data, it is because I have now some problems to setup the Internet-connection with my new mobile operator and that’s why I can’t say anything about the real efficiency of the software.