In honor of the 3G-enabled Nokia 3310 , we wanted to trace the history of one of the best-known phone models. What made it so popular and is it still relevant today? Our story begins with the Nokia 3110 , the first phone to feature the Navi-Key, a smart button below the screen whose function changes in each menu (the label on the screen tells you its current function). This became the primary way to navigate Nokia's feature phone interface, surviving well into the touchscreen era (when the physical button was replaced by the touchscreen itself). Nokia 3110 Two years later came out the Nokia 3210 . With 160 million units sold, it is to this day one of the most popular phones ever. Having Snake pre-installed probably helped. You can see the familiar design start to take shape as 3110's external antenna was chopped off. This was one of the first phones to do it, but reception suffered a bit. Nokia 3210 Finally, the Nokia 3310 came to be. Anno...