Original sentence: <ref name="100MM sold">.All models of the same generation typically consist of identical features, processors, and performance, in addition to available operating system upgrades, differing only in outer color and internal storage space.An exception is the currently available iPod Touch (fifth generation), as the low-end (16 GB) model is sold without a rear-facing iSight photographic camera and also lacks the iPod Touch loop.It can be used as a music and video player, digital camera, handheld game device, and personal digital assistant (PDA).It connects to the Internet through Wi-Fi base stations and is therefore not a smartphone; although, its design and operating system are very similar to Apple's iPhone.The iPod Touch runs Apple's Unix-based iOS operating system (called 'iPhone OS' until 2010) and includes bundled software to browse the Internet, view maps, send and receive email, view media, and work with office documents such as presentations and spreadsheets.Users type on a virtual keyboard  displayed on the screen.with a [[[user interface]] that is touchscreen-based
Edited sentence: All models of a generation normally have identical features, processors, performance and available operating system upgrades, differing only in outer color and internal storage space.An exception is the currently available fifth generation, as the low-end (16 GB) model is sold without a rear-facing iSight camera for taking photographs, and lacks the iPod Touch loop.It can be used as a music and video player, digital camera, handheld game device, and personal digital assistant.It connects to the Internet through Wi-Fi base stations and is therefore not a smartphone, though its design and operating system are very similar to Apple's iPhone.The iPod Touch runs Apple's Unix-based iOS operating system (called 'iPhone OS' until 2010) and includes bundled software to browse the Internet, view maps, send and receive email, view media and work with office documents such as presentations and spreadsheets.Typing uses a keyboard displayed on the screen.with a touchscreen-based user interface