How to use China Mobile to travel to the United States?

First of all, we should open international roaming service. You can call in the business hall or online. Generally, you need to pay a certain deposit because international roaming is more expensive. After going out, the mobile phone will read the local operator's network and can use it. When I traveled to Britain, there was a love message on my mobile phone saying that I basically didn't use the operator's because fried chicken was cheap. In Britain, you can make both local and domestic calls, so it is very necessary to use the phone when traveling.