My Treo 650 (Cingular Version) automatically connects to the internet for no reason.

When I'm on the phone or I'm playing a game or even when I leave the phone idle I find that it is connected to the net. This burns a lot of battery.

I reset the phone several times but it didn't help.

So I went into the preferences "Ask before connecting to the internet" to see if it works. However, It's irritating that it connects automatically even when I have no app running that needs it (such as Versamail etc.)