iPhone 4 , 4th generation iPad , and iPhone 5 support 4 major versions of iOS .
The iPhone 3GS , iPhone 4 , iPhone 5 , iPod touch ( 5th generation ) , iPad ( 4th generation ) and iPad mini ( 1st generaton ) are the only iOS devices to support 4 major versions of iOS , while the iPhone 4s , iPad ( 3rd generation ) has support to 5 major
IPhone 3GS