Going to the United States in a few days, I want to ask whether to open international roaming or buy an American phone card. Or rent a portable wifi?

Roaming in the United States, if it is a short-term travel and business trip, there is not much demand for telephone and internet access, and you can directly start international roaming. If there are many calls, it is recommended to apply for a local calling card. If you just want to surf the Internet, renting a portable wifi is a good choice.

At present, the international roaming fee has been lowered, which is still relatively cheap. The international roaming charges of American telecom users are as follows: