Some mobile network providers offer international SIM cards that allow you to access data services in multiple countries. These can be an especially convenient option if you'll be traveling to different countries. If your device has an eSIM (a digital version of a SIM card), there's no need to buy a physical card.
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If you want to avoid roaming charges when you travel, you have a few options to consider:
Keep roaming off when you don't need access to maps, email, apps, or messages so you won't be charged. You can switch roaming back on when you need these services. Turn off auto updates. Make sure your apps are only updating while connected to Wi-Fi in order to avoid roaming charges for services that aren't critical.