How to Tell Which Model an iPhone Is
Though most iPhone owners know what which model they have, not everyone does, and sometimes you’ll come across an iPhone and have no idea what it is. This is usually because some iPhone models share the same enclosure, and because of that it can be very hard to differentiate them just by a first glance. For example, the iPhone 4 and iPhone 4S look almost identical, the iPhone 3G and 3GS also look practically identical, and the iPhone 5 and it’s successor (5S?) are also likely to look basically the same. Thus, the easiest way to differentiate an iPhone when it’s not immediately obvious is by looking at the actual iPhone model number, then comparing that to a list of devices to determine what the iPhone actually is.