RIM thought iPhone was impossible in 2007
The iPhone "couldn't do what [Apple was] demonstrating without an insanely power hungry processor, it must have terrible battery life," Shacknews poster Kentor heard from his former colleagues of the time. "Imagine their surprise [at RIM] when they disassembled an iPhone for the first time and found that the phone was battery with a tiny logic board strapped to it."
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Interesting peek into an arrogant attitude of big mobile manufacturers when they faced the iPhone few years ago.