What "dual SIM, dual standby" means for your phone

It means your phone holds two lines at once and keeps both reachable: your home SIM for calls and texts, your KnowRoaming eSIM for data. Only one line carries data at a time, and you choose which; that choice is the one setting that matters when you travel.

More detail

Both lines show in your status bar, and a call to either rings through. Your home SIM stays on for calls and texts to your regular number, with its data roaming off so nothing slips onto your carrier's rates. Your KnowRoaming eSIM sits alongside it and carries data once you select it: Cellular Data on iPhone, Mobile data on Android. The taps are in Turn on data roaming for your plan on iPhone, Turn on data roaming for your plan on Samsung, and Turn on data roaming for your plan on Android.

KnowRoaming plans work on iPhone XS and later and on most Android flagships released since 2019. Your phone also needs to be carrier-unlocked. Check your exact model on the device compatibility page before you buy. A few older or budget models are single-SIM only, which is one reason to check before you buy.

Your plan is data only, with no phone number, calls, or SMS. Calls and texts keep using your home number.

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