Smartphone web browsing Ratio
Smartphone web browsing is highest in the early evening and not surprisingly is lowest when most people are sleeping but is still about 40% of peak usage. The second highest usage timeframe for smartphones is during commute hours at 90% of peak usage.
Tablet web browsing Ratio
Tablet web browsing also peaks in the early evening and drops off more than smartphone usage moving down to 26% during the middle of the night. Its subsequent increase in the morning and during the day is lower than smartphones.
Desktops web browsing Ratio
For desktops the highest period of web browsing is not surprisingly during the day when people are at work. It stays relatively high during the evening and drops down to the same level as tablets during the night.
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Souce : http://www.forbes.com/sites/chuckjones/2013/03/29/mobile-vs-desktop-web-browsing-activity-patterns/