For all users who want a 3G toggle back, and also want to have 2G/3G/LTE switch, here is working solutions.....

You only need to delete two files
Navigate to System/Libary/Carrier Bundles/Your Network Provider and DELETE(not Rename OR copy somewhere else on your phone or desktop PC) Overrides_N41_N42.plist and in "Signatures" folder above also delete Overrides_N41_N42.plist

And will have a toggle in settings when you enable Data