Recharge your prepaid card with 200 units voucher and get 15 days of validity instead of 7 days.
Recharge with 400 units voucher and get 45 days of validity instead of 30 days.
All prepaid subscribers, who were active before June 21st 2009, will get 90 days of validity instead of 45 days upon recharging with 400 units only once.