Media consumption. In the early 2000's people wanted a small phone because it was just a burden to carry it around. The information on display could fit in two

Media consumption. In the early 2000's people wanted a small phone because it was just a burden to carry it around. The information on display could fit in two short text lines (name, phone number) and there was not much to do with apart from calling and texting (short and costly text messages). Suddenly the phone stops being just a phone with a simple snake game and becomes a media consumption platform, plus an open window to Humankind's Knowledge Base (aka Internet :)). Of course you'll want a big screen for that. Also, people don't just use their phones on the street but everywhere, especially at home.