I'm new, but had similar problems
Running CM11 on PagePlus. I cannot access the Internet. I was able to at one time. Thought it was the Rom so I flash CM10.1 and Stock rooted rom. I reactivated the phone after the installs. Every time it says the network is connected but I cannot connect to the Internet or send MMS. Starting to think it is the phone. Any ideas?
I'm not sure the MMS issue has been resolved, as of yet. Last time I check the Development thread it seemed like there wasn't yet a fix. Someone will correct me shortly if I'm mistaken, I'm sure.
The data problem you're having is one that I struggled with for a couple weeks in CM11... I don't know how much help I can be, because I'm not really sure what ended up actually fixing it for my dINC. All I know is that I spent about three hours dirty flashing and restoring from nand backups, sometimes the full backup and sometimes just partitions. I also threw in a *228 somewhere in there. Anyways, Through persistence, and sheer dumb luck, I finally have a pretty stable data connection, as long as I don't use the mode switcher in DUbattery(that seems to mess 3g up until reboot).
sometimes it helps to toggle airplane mode on then off.