Please tell me how to turn off automatic roaming when I go to America

pu1. It roams automatically when you turn off and on your phone. You can use data more than anything else, but turn it off on your phone

2017-12-11

OK

pu2. You don't have to make or answer calls as Weepoo says, but data can be used without knowing. Go into the carrier's customer center and ask them to ban the use of data overseas. Then you can't use the data

2017-12-11

OK

pu3. I think I just need to apply for a data ban, and then I can get a call, but if I receive it, it costs money, so I don't have to answer it, and I can get a text message for free. If you write text messages, it's paid, and in the case of MMS, you get a signal that you're here, but you can't see the contents

2017-12-11

OK