One of the major new features of the new iPhone (iPhone Xs / Xs max and Xr) is the support for 2 SIM cards, one physical and the other integrated (eSim system).
Dual SIM card for iPhone Xs / Xr initially unavailable
If the functionality will prove very practical for professionals and frequent travelers, it will not be available as soon as the new iPhones are launched; it will indeed be necessary to wait for an update of iOS 12 before the end of the year to be able to take advantage of it. This information was communicated in the bottom of the Apple site, more precisely in a support page. However, it should be recalled that no French operator currently offers eSim packages; things should probably change by then.
Our Chinese friends will obviously not be affected by this small constraint since Apple reserves a special version of the new iPhones for them supporting 2 physical SIM cards because they cannot offer an eSim system in this country in particular.
To find out more about the new iPhones: