FYI - I have an unlocked Cingular 7290 that I've been using with T-Mobile. It has had the Vodafone 4.0 handheld software but I couldn't get the 7290 working (modem query never worked). I loaded the latest handheld software from T-Mobile and was able to query the modem right off the bat without any other changes. I doubt very many others will be in the same boat...