Metatrader 4 doesn'work with gprs

[Forex Trader]

Hi I have installed MetaTrader 4 demo on my PDA CECT M88. It works fine with wifi ADSL connection but It doesn't work with GPRS or EDGE connenction. MT4 can't see GPRS active connection so I can't login. I tried to set server proxy of my phone connection also on MT4 settings; but it doesn't work. Thanks