under the setting Enable 4G i have found the setting voice and data, im currently set for data only, what would happen if i set it up for voice and data? im on EE

Nothing will happen until EE launch VoLTE, you should set it to voice and data.

so when will EE launch VoLTE, i have googled it and it seems to be a trial at the moment and i guess once it is launched it will eat your data alowance?

Nope.

will await a big announcement