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Quite a while ago, I remember seeing an article on HN about Google encouraging new Android phones to have barometers, and some reasons for it (possibly something to do with faster/more accurate GPS fixes).

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That's correct. As I understand it, you can get a reasonable altitude estimation from the barometer.

I'm pretty sure it was in the S3 as well.

Yep, and the Nexus 4 has it too.

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