If you leave the 3g switch in your iphone settings on, will 3g still be used?

I just got a data package today and I was wondering, when you go to Settings> General> Cellular, and leave the Enable 3G/Cellular Data buttons on while your phone sits idle, will your data still be used and run out faster? I only have 2GB so I need to know before making a mistake and running out too quickly…

IPhone and gophone? Will it work

I've been reading a lot of posts about at&t supporting iphone's us of prepaid plans and I just want to confirm what I've been reading.
If I buy an unlocked iphone 5, I can purchase a $65 plan and set up my data, text and voice without having to go to at&t to get my APN changed. Is this right?
The data plan in the $65 plan does work with iphone?

I would really appreciate your help! The posts have kind of been confusing

Is it possible to play fruit machines on mobile devices?

I usually play slots in live casino. But I also enjoy playing these slot games on my mobile phone but just for fun. Are there any real money slots for mobile? And is it really safe to play for real money on mobile device?

P/S: I don't use iPhone.

How to watch smallville on my iphone?

Hey guys most TV apps don't work in my country, so do any of you out there know any website that allows you to watch series like smallville, Arrow… Etc directly on your iphone?

How to stop my voicemail password from popping up?

I have an iphone 4S and I have no clue what my voicemail password is but this notification keeps popping up all the time asking for my voicemail password even when I'm not trying to listen to a voicemail. I could be on a totally different app and it pops up. It's do annoying and it's been doing this for about a week. How can I fix this!

I Hate Itunes help! Computer problems?

So i have an iPhone 5 i want to sync it to my desktop computer through iTunes however awhile ago i had a iPod touch and the computer only wants to recognize the iPod i plug in my iPhone and nothing comes up where its meant to say devices nothing i've tried reinstalling iTunes turning my phone off using the back usb ports of my computer but nothing seems to work all i won't to do is put songs on my iPhone i don't want it to recognize my iPod i don't even use it anymore. Please someone help btw i have windows xp.

Added (1). How do i find out what windows xp version i have? And yep the latest version of itunes

also what's a sync cable isn't the charging cable the same?
i already have uninstalled itunes and did a cc clean everythings all good