Preventing incoming calls on secondary phone connection on an iPhone

You’ll have the ability to toggle each line “on/off” individually in Settings -> Mobile.

You might also find this guide helpful:

Using Dual SIM with an eSIM - Apple Support

You’re welcome.

Dual-numbers works VERY well.

In my experience, one of it’s few “areas for improvement” is that it’s not immediately obvious - at least to me - on which line an SMS text message arrives. (although the answer is just a “click or two” away)

It would also be helpful if each of the lines could be configured with it’s own unique ring tone. (a true “First World” problem)

Don’t hesitate to jump in …

… Apple’s install process is smooth, with each step well-prompted and explained; the most difficult part was getting an eSIM from the carrier.

However that process appears to have been largely worked-out w/ the “majors” as eSIMs have gone “mainstream.”

To stop getting calls on one of your devices, just turn off the other devices on your iPhone settings.

Watch the GIF below