My baby daughter is going to study in the United States and wants to talk to her on the phone every day. How can she make a phone call without changing her mobile phone card?

Mobile has a worry-free line, suitable for study tour. You can register an app account with a mobile phone card, and make free calls for a limited time without changing the card. It is also very cheap to buy overseas traffic inside. There are also free voice packages for calling different countries and regions, and it is no problem to make local calls;