3G averages 400 to 900 kbps and max is 3.6 mbps. HSDPA max is 14.4 mbps and AT&T is currently upgrading their network to hit 7.1 mbps. Implemented in a few locations now, others are being added.
But the actual download speed depends on many factors, most of which are outside of your control: the device processor and memory, the connection itself, your distance to the tower, tower congestion, network congestion, etc.
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