Yeah I suggest you go through all of the mobile settings and tick what would normally be active when its working. Even if a selection is selected. Select something else. Select what it was, then continue. Also if all else fails. Switch to world mode (GSM/EvDo/CDMA/LTE) .
Always reboot after changing those settings. And don't mess with the RUIM/NV option
I've done all that. I've rebooted so many times i see the boot animation in my sleep. All this I've done on 2 CM 11 builds and Gummy.
Please don't take this as a smart ass remark, but this isn't my first flash.
I've even checked on towers signal strength using my tab and wife One.
WiFi works. Hell I even talked for half an hour to my mother when she called while I was trying to access APNs. They're there, but data just won't connect. I sat it down and waited for an hour, nothing. Flash 4.3 (or restore backup) and I get data instantly.
Tried all settings, reboot. Nothing. I've tried toggling data and airplane modes....nothing.
If this keeps up I may throw this damn thing. My luck it'll get stuck in a wall and THEN get data.