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Backing information up on an iPhone is simple and easy. All you have to do is sign into Google Plus and save everything to your account.
There are many other ways of backing up messages and emails on iphone imactools.com/iphonebackupviewer/
If your iPhone has an aluminium backing, with a black cover down the bottom then it is a 2G. To differentiate between an iPhone 3G and 3GS, look if you have an app called 'Compass', if you do then you have an iPhone 3GS. The iPhone 4 is easy to identify because it has a flat backing and is more rectangular in shape.
Actually, It doesnt. 'Cause its the purpose of backing up the data. After the update, Your iphone will restore then it will put back your old data.
I just solved this problem on my iPhone. Log on to your iTunes account and check your billing status. My credit card information had expired and I needed to update the information. After doing this, I went back to my iPhone, updated my apps and the original message (tap continue and sign in to view billing) did not re-appear. My apps are updated!
everything
It is very difficult to answer this, but the main differences between the 5 phones Apple offers is Camera, backing, Siri, and several tweaks and fixes. So far the iPhone 4s overrules al of them.
Everything you want it to do!
Yup, all you have to do it plug it into your computer and open iTunes and sync everything.
This changes everything, again.
you should probably restore your iPhone. Plug it in go in iTunes, click on your iPhone and press the restore button. THIS WIL ERASE EVERYTHING ON YOUR iPhone IF YOU HAVE INFORMATION ON IT THAT YOU NEED RIGHT CLICK YOUR IPHONE AND PRESS BACKUP BEFORE RESTORING. The backup may contain whatever is breaking your app installs so if you still are having trouble bring it to an apple store and have them backup just what you need. Most likely this wont be necessary and just backing up and restoring should work.
iPhone because it has everything that itouch has and plus the iPhone has the option of phoning and it has a camera so iPhone is much better but much more expensive