Same thing here !
I am on Verizon and I have mobile data problems too...
web browsing apparently works fine, I can also search the google play store.... but if I want to download an app, or check my mail, or run the OTA updater I get an error saying no network available...
also, if I check the mobile network status in System settings>About Phone>Status I see that Mobile network status reads"disconnected".
I cannot post in the developers thread, let me know if u guys find out more!