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Since updating to 2.1 I can't find out how to easily close explorer. Now I have to go back all the pages until it closes when I get to the first page. Anyone?
You mean the web browser I hope.
You don't exit/close, the OS just puts it to sleep and will release the resources if needed so don't worry about it.
Since I have Wi-Fi nearly all the time, I only purchased 200 mb data plan and when my bill was wrong I called at&t and was told that if I left browser open when not near wifi, 3g would take over and an "idle" browser continues to actively send/receive data, thus the overcharged bill.Try the middle button
I found out that they indeed took away the "exit" option on the browser.
So the "easy" way to exit is push the menu button and select "windows" and press the "x" on the right of the pages you want to exit, then if you close the last page, it will reload your homepage. just push the home button to exit