Ok so I'm on att with an 8310. I was running os 4.5.46 and html wasn't working. I would "get images" and the two arrows would blink as if it were working and then nothing happens.
Yesterday I found version 4.5.52 floating around the internet. I installed it (at my own risk of course) and now html works fine in the e mails. Although it does take a while for all the images to load