Can China Unicom mobile phones be brought to Los Angeles, USA, to access the Internet?

If you use a domestic mobile phone card and want to use it in the United States, you need to activate international roaming in the United States in advance, so that you can use it after arriving in the United States, but the relative cost is a bit high. For specific details, you can also log in to China Unicom's online business hall to consult the online customer service at your home location.