with the new 3.0 software update it is expected to be possible
It is correct to say iPhone 5S is an upgraded iPhone 5.
no
apple does indeed have yes I just upgraded to an iPhone 12 mini
not yet, but it will be coming out soon for the iPhone
If you are referring to an iTunes account, they can share. They do not need separate accounts.
I just upgraded from The 3G. I upgraded to the 4GS, and I love it!
The Iphone 5 came out in September 2012
Yes.
the new iphone with verison is coming out on Feb. 10
Considering the iPhone 4 just came out the iPhone developers will be working on it or maybe not making one because there is no way to improve the iPhone.
Proably on launch day. The iPhone has been on Sprint since the launch of the iPhone 4S.
The iPhone 4 is now widely available but it has been very quickly superceded by the iPhone 4S.