It is entirely your decision. No one can make it for you
The iPhone 2nd generation
yes the Iphone 1st generation did have a camera.... 2.0 Megapixel
IPhone 4S
2nd generation
2g is 2nd generation 3g is 3rd generation
The iphone 3g is the third generation iphone , is that what you are asking
The iPhone 4s is the 5th iPhone that Apple has made.
iOS 4 was released long ago back in 2010 along with the iPhone 4 and was a free update. It could be downloaded on any device except the original iPhone and 1st generation iPod Touch.
Yes, the iPhone 3G/3GS is thicker than the iPhone (first generation) at its thickest point. The iPhone 3G/3GS is 12.3mm while the iPhone (first generation) is 11.6mm. However, the iPhone 3G/3GS has a tapered back, and has roughly the same overall volume as its predecessor.
Between iPod Touch 5th generation and iPhone 5c, iPhone 5c is much better.
2g is 2nd generation 3g is 3rd generation. 3g is much faster. iPhone 3G can support WCDMA and HSDPA frequencies, but the iPhone can't.
3rd