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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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imahe t1_j9k0ohj wrote

Yes!

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dskatter t1_j9k26ki wrote

Try it and find out?

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Gotyce t1_j9kxmnh wrote

Barely, painfully slow at least.

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doogm t1_j9k8ete wrote

Yes it does.

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JDT33658 t1_j9krjt5 wrote

No Apple put it there because the toggle looked nice.

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Truth_Seeker_MT OP t1_j9lq9s7 wrote

I'm sorry... my explanation post didn't make it up.

I have an iPhone 13 Pro with a both a physical sim and esim from different vendors. Both have unlimited plans. One of my plans has terrible coverage outside my city and it never seems to switch to the other.

Has anyone else had this work? Are there other settings I should look at?

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Immediate-Pea-4722 t1_j9m06q1 wrote

For this setting to work your first plan needs to have no coverage at all, that’s what makes this setting so frustrating. What you can do is change the to the better line on the same page as this setting. That’s what I currently use: Primary eSIM for my actual phone number associated with iMessage, second physical SIM for DATA with the switch enabled.

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phlavor t1_j9mna7v wrote

Yes! I had AT&T on one SIM for my personal number and Verizon on another SIM for my work number. But I had all data go through Verizon, and would forward my personal number to my work number when traveling internationally as work would flip the bill for international calling. It worked very well and was something I rarely had to deal with once I set it up.

Eventually I changed the AT&T personal to Verizon because, well, I hate AT&T.

And when I left that job, Apple was able to transfer my personal sim to a new phone and my personal contacts went with it and my business contacts stayed on that phone which, I believe is more a function of iCloud.

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meghrathod t1_j9ogyiz wrote

Same, I’ve this activated, I also live in a area with poor coverage of one network but it’s good else where but it never switches automatically

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