After purchase any internet package from any mobile operator your package data are limited. If you use 3G internet package it will finished very soon due to high seed data transfer rate. Many of us finished one month package with in one week. Due to unnecessary usage of internet data people are really worried about this, but if you want to use your package full month you need to notice some future of your phone setting. First you have to calculate your data plan how much you can use in one day.Before download any files it should must with in your one day package limit. When you will play a video from youtube you must set resulation in minimum level. May be you download some games and application in your phone which have advertising future, when ever you open it those games and application are automatically open advertise. It is taking more data from your package. You can off advertising by go to the application setting. You also can turn on update all of your application in Wifi mode. In Facebook you can off auto video play setting. In google map satellite view is taking high data so you can avoid this option. If you use your phone as a modem you should off automatic update from your computer control panel. You also should turn off your phone synchronize by open Account & Sync option.