Rooting is totally unnecessary, dont sweat it. there is some things you can only do with root, but if you are unsure if you should or not, and dont have a clear reason of why to root, then dont bother. its a risky proccess, and for someone who probably is not a power user, there is no real reason.
and your internet data, (and calls and texts) are the same even if you do root, you will not have any changes, since that is on the sim card, not the phone itself, so even if you root, nothing will happen to your gb.
Press Thanks if i helped!