From the Mobile Tariffs Forum:
Previously, everything was simple – there were 2 tariff plans that were absurdly simple.
Now - type every 28 minutes every hour on the full moon day at the end of March for calls outside the area - free, with this service you need to activate by going out at 2 a.m. at night and turning your face to the north to shout "I love life" and kick 3 times with your right leg!