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I know it's the trend to talk about "smartphones" as if it was a revolution but it's not. Actually the concept of smartphone is a marketing term used by some manufacturers to advert and differentiate their products but in reality, it's just the high end class of phones. This class has existed for more than a decade. in 2000 we were surfing the web in text mode over the wap, i-mode, etc... and we were using J2ME applications for everything. This class of phones has been sold by billions since a long time ago. There were like 100 phones for 1 PC in 2000. I'd even say there are LESS phones sold these days than there were in 2005.
So modern "smartphones" are far more capable than the previous ones, that is true but the previous ones still qualify as computers or the Apple II does not.