I agree with you on the Dell, I have never had good luck with them. I have had the same apple to 7 yrs with no problems except little minor ones. That is all I got for ya :-)
I have it all blocked now and I was playing a stupid game with a friend, plus I was using instead of getting up to go to my computer. I deleted the with friends game and now will get on my computer.
Not sure if it matters to you but some apps use your data. last month i came close to going over mine. What i had that uses it is the flashlight, my pictures and calender. Even the dictionary and a solitaire game.