There are several restrictions in the changing process:
You can change your package only once a day.
You can increase your package's time period, but you can not decrease it.
(For example, if you have a 6-month package, you can upgrade it to a 12-month package, but can not downgrade it to a 3-month package.)
In order to change your package, follow these steps below:
1. Go to "My Subscription" page.
2. Click on "Change My Subscription".
3. Select your new package.
4. Click on "Subscribe".
Your package will be changed.
P.S. : On the day you change your package, you will have minutes belonging to your first and new package. The next day, you will continue with your new package.