Exclamation Note 2 Mobile Data Fix.

If after installing a new rom and find that your mobile data doesn't work, go to Settings/Connections/More Networks/
Access Point Names. If there is nothing written, simply Google (your carrier name) APN settings. After finding them, manually insert them into the empty spaces. If completed correctly, providing there isn't a problem within the kernel, your mobile data will start working almost immediately (providing you remembered to switch it on)

I hope this helps others that face the same problem.