I'm running cyanogenmod 7.2.0. Everything works.
But when I've flashed other ROMs (latest cleardroid and MIUI for Inspire) - my phone had working mms and phone service (tested), but neither ROM could access the internet (browser and twitter, etc). "Service Unavailable" was the error in the browser.
Sent from my rooted HTC Inspire 4g modded with cyanigenmod 7.2.0