For the last 2 billing cycles the phones on my account have been using all of the data on my plan! I have 3 lines and a shared 16G of data and two of my lines have been using 7 and 8 gigs each! What is going on? Why are we going over? Nothing has changed on our usage of lines. We connect to wifi at home and my daughter connects at school but yet her data usage sky rockets. This is really making me mad and considering a different phone company. 3 phone lines should not be using 16 gigs of data in 2 weeks!