What are the main functions of worry-free banks? Is it easy to travel abroad?

Worry-Free app is a product of China Mobile International Company, which provides one-stop overseas services for mobile users, including 60% off overseas traffic, overseas calls, strategies, exchange rates, translation, etc. Basically, all the functions commonly used to go abroad are available. If you have a plan to go abroad, you can buy traffic without worry, and you don't have to change your number when you go abroad to surf the Internet. The transportation is cheap and convenient, which I think is great.