Soon after Apple's iPhone went on sale six years ago this week, you probably started spotting hastily-written emails appended by the words "Sent from my iPhone." And then, a bit later, you spotted a lot more. Of course, the iPhone was not the first email-enabled smartphone to attach such a message to outgoing emails. So did various Treo handsets (remember those?) and BlackBerry phones, pre- and post-iPhone. The iPhone's instant success, and its default signature, simply made the practice far more prevalent. ...



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