Originally posted by Connor
This should help:
You must login or register to view this content. You will not get all features of iOS 4, but it's the best you are going to get with a iPhone 2G.
Honestly idc about the features lol all i want is for the version in my Settings>General>About to say Version : 4.0
There are apps i wan that only works on iOS 4.0 or higher.