I am assuming that you already have cloudy g3 up and running if not STOP and go install it -----> http://forum.xda-developers.com/show....php?t=2783192
Okay Cloudy G3 is now installed on your G2 first you will notice that there is a line going through the data toggle on notification pull down we will get rid of that first by doing a build prop edit:
The easiest way to to a build prop edit is to download rom tool box lite from play store (http://tinyurl.com/9reyx24) after you have rom tool box lite you are going to open it and swipe one screen to the right you will now be under performance overview click on build prop editor click the search bar and search for these 3 build props and change them accordingly after the first one it will ask you if you want to reboot click dont ask again then no
ro.carrier=spr (NOT SPR)
ro.build.target_operator=spr (NOT SPR)
REBOOT DEVICE NOW
Now when you pull down notification panel you will be able to turn data on and off....
Now mobile networks is still greyed out?
to work around this we will need an app called Tellinfo it is found in playstore (http://tinyurl.com/o3e8s3q)
go down to preffered network type and select "wcdma prefered"
this will allow network to become active
now you may change any of the settings that you need to in mobile networks
then go back into tellinfo and change preffered network to lte/cdma/evdo or lte/cdma/evdo/gsm/wcdma which ever one work best for the area you reside in i use the longer one. you will know which one is working because gsm service will read "in service" if it doesnt work it will say emergency calls only
WHEN YOU CHANGE BACK FROM WCDMA PREFERED THE BUTTON WILL GO GREY AGAIN THAT IS OKAY DONT WORRY ABOUT IT AND IF YOU TURN OFF OR RESTART YOUR DEVICE GO INTO TELLINFO AND RE SELECT YOUR PREFERD NETWORK BECAUSE FOR SOME REASON IT DOESNT STICK IM NOT SURE WHY ---SO I DOWNLOADED RADIO SWITCHER FROM PLAYSTORE AND WAS ABLE TO REBOOT WITHOUT HAVING TO GO INTO TELLINFO DONT KNOW IF IT WAS COINCIDENCE OR NOT WORTH A TRY MAYBE
ALSO IF YOU GO INTO SOFTWARE INFORMATION AND IT SHOWS BASEBAND UNKNOWN THAT DOESNT MATTER EITHER
Discovered by @lurtis
If you get g2 tweak box you can fix the signal icon mess - - - - - > https://play.google.com/store/search...x&c=apps&hl=en