Why aren’t calls to my friend’s 050 number free of charge?

Calls between My 050 users are free of charge. But if you hear voice guidance in regard to your balance, it means your call is going to be charged and that you are calling from a My 050 account that doesn’t have a private 050 number issued to it. Please open the app, tap My Account >> 050 Number. If you do not see the 050 number, please follow the instructions to get one.