Just a data point, not working for me in Portland, OR. I'm on a BWC account, using wap.voicestream.com for TCP.
FWIW, I've posted about this on one of my sites, www.tinyscreenfuls.com
, and tried to get as many other gadget and tech sites as possible to link to it, to raise awareness about the issue. Hopefully, we can make T-Mobile sit up, notice, and do the right thing.