The Ericsson T68 is famous for having a camera add-on - one of the earliest examples of a mobile phone that can shoot photos. But modern smartphones have so many features that there are no gaps in their capabilities. Still, add-on companies have to sell something and the results are... well, we'll let you be the judge. Do you yearn for the ergonomics of old-school handsets? Just plug in one of these and you'll be transported to the good old days of using payphones or waiting until you got back home to make a call. There are Bluetooth versions too, for those of you who want to look retro...