What do you do in these situations? (Bạn làm gì trong những tình huống này?)
1. You don't have any credit.
2. Your mum's phone is engaged.
3. You want to communicate with your friends. They're outside, but you're in the library.
4. The telephone conversation is finished.
5. You're bored with the ringtone on your phone.
6. You phone a number and it isn't correct.