By Brian X. Chen
The evolution of the smartphone can be summed up by two trends: Phones just keep getting bigger. They are also getting pricier.
The chief examples are phones from Apple and Samsung Electronics, the top handset makers. Samsung this week introduced the Galaxy S9, its new flagship smartphone, with starting prices of about $720 and, for a slightly larger screen, $840. Years ago, Galaxy phones started at about $650.
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