yes, you can just use wifi access to use the Internet on your iPhone
No you do not need WIFI to use the iPhone. The iPhone works with either 3G or WIFI. Some apps require WiFi to download or run depending on their size. I find wifi works best though and is faster. YouTube videos are extreemly clear and crisp with wifi.
If it is wifi then no it does not use your credits.
Yes, you can use your iPhone 3G(S) to access the Internet if you have an available WiFi connection.
Yes unless it is your WiFi you are using so technically you are still paying for it
no you can use the mobile network for Internet
Yes or public wifi
Any where that WiFi is available. There are no restrictions.
yes it can just make sure you are connect to the internet so you can use wifi
How Do I get my wifi network back on my iphone
sorry no, iPod has to be connected to WiFi for it to work
no