Code:
For each friend that installs OkayFreedom, we will give you and your friend a 500MB increase in data volume*.
Donwload here : OkayFreedom (ref)

Install

After Install go this site : https://www.okayfreedom.com/specials/pcadvisor0615/of

Enter your email and you will have Premium code

Open Aplication from your System Tray and "Enter Premium Code (Serial Number)" which you have at your email.

Enjoy


This will looks like this.