Btw 4.7GB is a heavy user?!
I checked my bill, and most months I used less than 0.5 GB. My peak was about 1.9 GB while traveling. So I would say that yes, 4.7 GB is a heavy user. You're obviously downloading quite a few videos and/or apps over your cellular connection, which you should only be doing on wifi.
I know everyone wants a perfect world with free fast wireless internet, but this is still 2014. I still remember having to pay by the minute for landline internet access at 56k. Be patient people, we've come a long way in a short time period. It takes time for technology to develop. The first iPhone was only released 7 years and 9 days ago. Now nearly everyone has touchscreen smartphones with 4G LTE, consuming gigabytes per month. That's amazing.