I had the exact same problem on my Vario II. they said it must be a fault, so sent me a brand new one 24 hours later. This had the same "fault". I told them it was completely unacceptable and after A LOT of phone calls and ranting they eventually sent me a Vario III. This still did not show the "H" logo even when a colleague of mine with the exact same package (Flext180 + WnW) and handset did... We swapped sims, and on my handset, he instantly got HSDPA, but on his handset, I only got 3g.
I went balistic and told T-mobile that it must be my "set-up" on the network. the technician I got through told me that "the HSDPA flag had not been set on my account so I've never had it" - even though I've been paying for it for over a year!! Guys - learn from this: The technician told me that most operators did not understand the difference between HSDPA and 3G. The only reason that I didn't recieve it was that some idiot had never checked the box on my account.
Unfortunately, my Vario III (now fully working at lightening speeds) was stolen two weeks ago so I had to buy another handset off ebay. JUST MY LUCK!!!