What you can usually expect:
Your billing period commences always on the 20th day of the respective month. You will change the tariff on the 12th day of the given month. To avoid waiting another 8 days for the next period to begin, we will activate the selected tariff right away for you and calculate it so that you may use it immediately. Therefore, you will only pay a proportional part of the tariff price for 8 days, and you will receive the corresponding number of units. From the beginning of the next billing period, you will receive all free units from the respective tariff for the regular monthly price. The fee for the original tariff would either be recalculated or charged for in full amount, depending on the type of the tariff. Unused free units will not be transferred after changing the tariff.
Are you cancelling your telephone number or transferring it to another operator?