your phone will do updates automatically if you dont have ssettings changed to something else. I persoally always leave my mobile data off unless I am specifically using it. Especially when its as easy as sliding the drop down menu down and pushing a button. If you dont have wifi at home I suggest shutting mobile data off at night when your in bed and not using the devices. That would help with data usage your not "using" As fas as the jetpack, I've seen and heard too many issues with that thing and personally think that its a waste of money, especially since your phones on that plan ahve mopbile hotspot built into it.