Google Talk can be used on the iPhone.
everything
For an official Apple iPhone tutorial, go to: http://www.apple.com/iphone/guidedtour/tour/large.html
Jan 31, 2011 " Thank you for making us the BEST place to find your used Apple ... Purchase a used iPhone to get the absolute BEST price on your iPhone.
The region format on iPhone is used to delete and factory reset your iPhone. This is usually done when your iPhone becomes slow. This option is available on the setting tab of your iPhone.
an iPhone can not be used to provide internet access to the PS2
A iPhone can be used on a airplane. You will not be able to call or use the internet.
Unfortunatly if you didn't sign up for MobileMe when you bought your iPhone, you are out of luck.
If you are really looking for a place to find a cheap IPhone 4 whether the IPhone is used or brand new, then you should definitely check out the apple store.
calling and texting
MobileMe
No!