how can i update my iphone 3gs
my cousin gave me his iphone the other day and i tryed to dowload apps and it would not let me because i have ios 4.2.1 so i have asked multiple times how to do it and even tryed downloading online but none work and tryed on itunes but that said its the current version and its not so i was wondering could i go from 4.2.1 to ios 5 or 6? is it even possible? please help?:(
iPhone 3GS, iOS 3.0