They do calculate for 5 days, how much your rental would be according to your plan. Besides you will get other charges if u have opted for installations, modem, Tel rental. Also your free calls are calculated for 5 days according to your plan. You can do that simple cross multiplication yourself to calculate your available free calls for 5 days. If you do not exceed your free calls, and if do not exceed around 400 mb (for 5 days), considering all your charges expect that bill to be around 700/-. I am telling you from my personal experience.