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shocontinental t1_j9kac4f wrote

This must be a post I’m too iPhone SE to understand.

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Immediate-Pea-4722 t1_j9kcofs wrote

That’s a feature when you have an iPhone with 2 active cellular plans (Dual Sim is available on iPhone XR, XS, 11, 12, 13, 14 and SE 3.)

The way iPhone handles Dual Sim does not allow Data to be active on both plans at the same time (that means the iPhone uses can receive and send calls on both sims all the time but uses the data plan of only one, even if the second one has better reception).

The feature OP asks about, allows iPhone to switch to the second data line if the first one fails due to bad coverage.

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ecs0013 t1_j9kkdyr wrote

Great explanation — just to add FWIW, the second-gen SE supports it, too.

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