If you got good data before, I'd say reflash the baseband V8. Try wiping the cache and dalvik cache to hopefully have it work. I have problems turning on my data sometimes, really annoying.
Well that didn't work.... I wiped cache first, no good. Wiped dalvik, no good. Wiped cache then dalvik, no good. Wiped both, then reflashed baseband, no good. I've tried every combo but my data comes and goes, even when greyed out it will update facebook, etc.... so not really sure if it's "off" or not, or if it's just a glitch.... funny that it didn't do it until I did the GPS, I'm wondering if maybe the GPS fix or the fact that it's on might be messing with the radio's. I think I'll try turning off the GPS, and data and possible put it in airplane mode and see what might fix it. I'll take notes and post them here if I find something that works......