ELI5 mode
Data roaming enables mobile devices to connect to the internet and use cellular data services when outside the coverage of your primary carrier's network, by automatically linking to partner networks in other regions or countries. It's a lifesaver for travelers needing maps, emails, or apps on the go, but watch out—without a plan, it can lead to eye-watering bills from per-megabyte charges. Modern innovations like eSIMs and bundled global passes are taming its wild costs.
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