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I spent only about an hour with the G1 ($180 with two-year contract; unlimited data plans start at $25), which is co-branded by Google and handset maker HTC. Disappointingly, the phone is a bit thick and heavy. The screen slides up to reveal a keyboard, but the way the keys are recessed between raised areas on either side makes for slightly uncomfortable typing. And while the big touchscreen is nice, you can't resize objects simply by pinching or stretching them with your fingers. Once you get used to this trick on the iPhone, you expect it on every handset.
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