When you travel internationally, your iPhone can connect to any of the local carriers. Your own home carrier will probably have a preferred one that might not have the fastest or best service; here’s how to force it to use something different.
from How-To Geek https://www.howtogeek.com/361202/how-to-manually-change-the-carrier-your-iphone-uses-and-why-you-might-want-to-do-it/
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