Props to T-Mobile
I was having an issue getting my Blackberry email to work. I logged a ticket after a day without email (blessing and a curse). Two days later I called back to check status and had to escalate. I had a feeling it was a provisioning problem - it was - and they resolved it by the end of the business day Friday. Well done T-Mobile!
I don't know what they use for provisioning but it was fast to solve the problem once correctly identified (took two minutes).