I have no idea! I'm trying to figure it out also. If you find out let me know please.
Yes, they make and manufacture mounts that are compatible with both the IPhone 4 and the IPhone 4s.It's called the "Glif" and it's available and most retail store's.
Yes, you can run iOS 7 on the iPhone 4.
no
iOS 5 will be compatible with iPhone 3GS as well as iPhone 4.
Almost all of the applications on the iTunes store is compatible with the iPhone 4. Exceptions are applications which are for the iPad.
No, Facetime is not compatible with any pre-iPhone 4 models. This is because it requires a front facing camera, and only the iPhone 4 and iPod Touch 4 have both a front facing camera and are Facetime supported.
Yes. Both the iPhone 4 and iPhone 4S work on Verizon's network. However, you will need to buy the version of the 4 or 4S that is compatible with Verizon.
iPhone, iPhone 3G, and iPhone 3GS
Not without a Qi compatible external iPhone shell.
Iphone 4 cases are not compatible with 3g iphones because the newer iphone is not made like the 3g. They have different bodies are are much more angular that the 3g.
Yes. I actually have an "iPhone 4" Otterbox for my 4S. The only slight problem might be the small lack of coordination for the hole for the vibrator switch. This only will occur if purchasing an AT&T iPhone 4 case, but you still have access to the switch.
no, ibooks is only compatible with an iphone