The only difference is the network that it runs. The 2G iPhone is slower when you are browsing the internet, while the 3G has a faster network. Also, the iPhone 3G has more of a 'slimmer' feel to it, though technically slightly thicker.
Other than that, there is no major differences, and they both run the same software.
The iPhone 2G is much slower than the iPhone 3G.
2g is 2nd generation 3g is 3rd generation
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.
3G has better memory and faster internet. The higher the G the better. This is reffering to an Iphone.
There is no difference in VISUAL size between the two. The difference is the gigs. Each gig has one milion bites of memory and so the iPhone 2g has two million bites of memory and the iPhone 3g has three million bites of memory. It sounds pretty complex, I guess you could say, but it really isn't.
gosh no. the 3g is wayyyyyyyyyyyyyyyyyyyyyyyyyyyyy better
3g BTS is greater than 2g bts. and it is with new technologies.
computers
computers
iPhone/iPod Touch/iPad iPhone: 1G, 2G, 3G, 3GS, 4 iPod Touch: 1G, 2G, 3G iPad
The 3G has 3G connection, and I believe it is a little faster too.
Original Answer by Chohw0916 Edited by Arianna Lovendino Trust me. I have tried this. The case does fit the iPhone 2G. Though, there is one problem. The case will be very tight because iPhone 2G is a bit thicker than iPhone 3G.