I purchased the HTC Vivd about a month ago, I am coming from using a BB. My question, never had this problem before with my bb, i have on my monthly plan 200mb in the month i have have had this phone i have used double and almost triple that 200 mb. i downloaded a task killer to kill whatever is running and not sure if that will work yet, but what is the difference between using wifi and 4g. if i use wifi am i using up mb? I i use 4g am i using up my mb? I not to savy with this sort of stuff but just trying to learn. Can anyone help!!