You can switch between numbers and letters on the Keyboard. It is found under the Numbers section.
yes the iphone is easy to use!
how to use vocalive in iphone first time
you do not ( you can not do that )
yes, you can just use wifi access to use the Internet on your iPhone
not yet, but it will be coming out soon for the iPhone
yes
will an iphone 5 will use nfc
no you cannot use ipod and iphone apps on itunes, but you can buy the apps on itunes and put them on your ipod and iphone
No you both have to have an iphone 4 :)
the best way is to use the find my iphone app
Yes, I used an iPhone case nit iPhone skin. Because iPhone skin is a sticker. It does not provide full protection to your iPhone. Go I use Gadgtezkart's iPhone cases all the time for my iPhone.
Google Talk can be used on the iPhone.