1. Can you have multiple email accounts? Eg Exchange, Gmail and Hotmail all at once?

YES

2. When typing in a phone number in the call section, it splits it into the US format, does this change when setting the country? Or is it like this regardless of where you are in the world?

YES, I think so, I'm in the UK, and it does not split at all

3. Can you set backgrounds/wallpaper to the standard screen of the iphone?

You can set the wallpaper on the Welcome/lock screen, not the icons pages, unless you jailbreak the phone and install custom 3rd party apps that can set those screens.

4. Can you move about the main menu pages, or does it just fill one page up and move onto the other one?

YES, you can move the icons around by holding them for a few seconds, then dragging them, to different pages if you want to.
You can also save Web Shortcuts to these pages. Personally I have all my web shortcuts on one page, programs on another, and games on another etc


5. Can you set different proxy address depending on which wifi network you are connected to automatically?

YES, you can change the Wifi Proxy settings for each Wifi network to off, manual or Auto

Thanks very much for the reply paholman

Kimbie