The latest version is iOS 7.1 , which is available for the iPhone 4 , iPhone 4S , iPhone 5 , iPhone 5C , iPhone 5S , iPad 2 , the third-generation iPad , the fourth-generation iPad , the iPad Air , the first-generation iPad Mini , the second-generation iPad Mini , and the fifth-generation iPod Touch .
iPhone OS 3 was n't available for the the first iPhone and iPod Touch and was later available for the iPad when it was released .