Multiple choice general knowledge science & technology What is the model number of the latest iPhone released into the market? iPhone 3G iPhone 3GS IPhone 3GS iphone 3GS Reveal answer Fill a bubble to check yourself B Correct answer Explanation The iPhone 3GS was the latest iPhone model when this question was current (circa 2009). It was the third generation iPhone with improved speed and performance compared to the iPhone 3G. The spelling variations in options C and D are incorrect.