If it has built in, I do not want to install extra apps. The more thing running, the more problem. Hence my asking.

wan to ask, now the social apps like whatsapps , viber bla bla can use or not lol...last time heard is data sucker...

Yes that is the 3 or 4 step process.

But I find, from the pull down menu and touch on "mobile network", it will take me directly to where I can select 2G or 3G. That is only 2 step process. Unfortunately sometimes it work and sometimes it doesn't.

When you are not connected to internet, I mean by GSM or 3G, u can press on Mobile Network to change to either GSM or 3G network. When you are in the data connection, when u press on Mobile Network, it will bring you to the connection manager.

thats mean got two function

How often do you need multi-tasking capability of the N8?

I could live without this feature and in fact find it annoying. Whenever I move to a different application and if I don't close the 1st one properly, it still run in the background sucking battery with Maps the main culprit. Come to think of it, iphone is right and by doing so, makes the phone much faster etc. So can we set our N8 to be Single-Tasking?

don't think your battery can keep up for entire day. I am willing to forgo multitasking for better battery life. Without battery, all phone becomes mere junk.