I was a teenager in 2006 and still understood mobile devices with fast internet connectivity with photos, videos, mapping services, and video calls were going to be a big thing soon, as to a tech nerd like me it was already partially a reality. By that time I already had Google Maps on my phone, was uploading photos to web services through MMS gateways, was browsing the web with Opera Mini, had my email on my device, and streaming internet radio to Bluetooth wireless headphones. It seemed obvious to me that these devices would get faster over time and that the cameras would get better, as I had already seen the progress from the earlier 320x240 cameras to >1MP cameras on phones, mobile data speeds increasing from GPRS speeds to 3G, and WiFi both becoming more common and jumping from 11Mbps to 54Mbps within just a few years. I had seen the greyscale and slow Palm IIx device my dad used to carry turn into the color Blackberry with constant network connectivity happen within a few years, it seemed obvious these devices' functionality would continue to rapidly grow and move into all kinds of markets.
In 2006 I don't know that I would have thought Apple would have dominated the market as much as it has, but the iPhone hadn't been announced yet nor would it have 3G for another year after that. In 2007 I got my first phone with a front-facing VGA camera which could do video calls over 3G networks, before the iPhone had native apps or 3G.