the problem is that you might have both available in you area The online ordering will let you know pretty quickly
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www.att.com/u-verse/avai ··· ndex.jspWhen you put your address in, if it says tv, internet & phone are available then you have VDSL available (Modems 3600/3800/3801)
if it only show internet than you are probably on the IPDSL (moto nvg510)
sometimes the vdsl & IPDSL are available in the same area. If you are only ordering the internet only then you may get the IPDSL service so they can save the VDSL ports for cx who order tv service that is why there may be some grey area
let me know what you find out