I, also, use
https://web.da-us.citibank.com when I go to Citibank via my Treo. I just tried to use the mobile version
https://web.da-us.citibank.com/cgi-b..._Id=CitiMobile
but in order for me to use the ATT 8525, I had to select Cingular as my provider. Unfortunately, my provider is Sprint and after going through the prompts, I never received the text message instructions on my phone.