Little room for growth in crowded field.
Four handsets based on LiMo specification.
But researchers warn of customer apathy and other risks.
18 million handsets sold as customers demand new features.
DRam and handset profits offset Flash and LCD slump.
Cheap and quirky Nintendo design holds off Sony challenge.
Hands off 3G, digital TV, RFID, Wi-Fi and DVDs, say US trade officials.
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