Connect to either WiFi or 3G and go to Safari. Start searching.
yes, you can just use wifi access to use the Internet on your iPhone
When you use the Internet.
if you are using something that requires it then yes it does use internet
Yes I have a iPhone On tmobile and no Internet
Yes, you can buy international iPhone's version (a iPhone with out Internet) in eBay or amazon, some iPhone that sell outside U.S, is international iPhone' version. You can use it with any network that you like.
no you can use the mobile network for Internet
YES
yes .
You get faster internet then the original iPhone.
If it is wifi then no it does not use your credits.
contact to people and to play and to use internet
Yes, you can use your iPhone 3G(S) to access the Internet if you have an available WiFi connection.