What happens to my home phone number while traveling?

Nothing. It keeps working as it always has. Your plan is data only, with no phone number, calls, or SMS. Calls and texts keep using your home number. Your home line sits on the phone next to the KnowRoaming line, and most phones run both at once without you doing anything.

More detail

One thing to do before you fly: turn off data roaming on your home SIM, so your data goes through your plan and not through your home carrier's roaming rates. Keep the home line itself switched on, so calls, texts, and any codes sent by SMS still reach you. See Turn off data roaming on your home SIM before you fly.

Calls and texts on your home line abroad are charged by your home carrier at its roaming rate, the same as they would be without KnowRoaming. Calls over an app on the KnowRoaming line use your plan's data instead. Wi-Fi calling on your home line works where your carrier supports it; see Calls and Wi-Fi calling while using your KnowRoaming eSIM.

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