Apple will introduce the eSIM function for a second telephone line in the upcoming iOS 12.1 update.
As we already suspected here, Apple will add the functionality in the coming 12.1 update. This allows you to activate an eSIM in addition to the conventional SIM card. The support of your provider is necessary for this.
Two independent mobile numbers.
If you then have two phone numbers, you can specify which should be the standard number with which you call a specific contact. You can also define a number for iMessage and FaceTime and you can only call one number at a time (no toggling). However, SMS will arrive on both numbers and both can also be called at any time.
