AT&T makes sweeping changes to data plans, iPhone tethering coming at OS 4 launch

You might think that AT&T would hold off for a national HSPA+ deployment or a full-on LTE launch before tweaking its data pricing strategy, but not so much -- the carrier is coming out swinging today with some significant changes that should benefit the overwhelming majority of its smartphone users (and could stand to harm a select few) including support for tethering when iPhone OS 4 launches later this year.

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