In you balance account if you have P2 you can now call to your friend.
My friend tell me this promo which the exciting moment in Be Careful with My Heart episode she text me.
Because of excitement I want to call her but I have only P2 balance load. She tell me that I need to use *2222 promo.
So I Dial *2222 + the 11 digits number of my phone. Like look this - *222209093592562, enjoy!