On Mon, 12 Jan 2009, Levi Wallach wrote:

> AT&T and Tmobile use a GSM-specific data network (rather than Sprint and 
> Verizon's CDMA), so it's an entirely different animal.  It's called 
> HSDPA, although I think I've seen that shortened to HSPA as well.

Yup.  Most protocols have different upload/download speeds and HSPA is no 
different.  The only thing a bit unusual is that the two sides are often 
discussed individually: HSD(ownload)PA and HSU(pload)PA.  Most people 
don't care about the upload speed unless they're using it as fixed 
wireless.

-Jason

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