The Dell Venue Pro smartphones running Windows Phone 7 are now available for order in the U.S.  The phones operate on T-Mobile’s network and are locked, so they cannot be used with AT&T’s wireless service.

Available with two memory capacities, 8GB and 16GB, the Venue Pro does not have user-replaceable memory card expansion.  The price of the two models is $99 and $149, respectively, with a two-year T-Mobile service contract.  Without a new or re-upped contract, the prices jumps to $449 and $449. 

The full-price versions are also locked to T-Mobile service.

If you want to take a Venue Pro – which for many Windows Phone watchers is the most anticipated of the 2010 WP7 releases – for a spin, you’re out of luck: at this time you can only order a Venue Pro directly from Dell.  T-Mobile stores aren’t currently selling the new Windows Phone, nor are there any indications that it soon will.  That said, after the Nexus One direct-sale disappointment, we wouldn’t be the least bit surprised to see the new Dell phones in T-Mobile stores next year.