Better use of multiple SIM cards may soon be possible for the Pixel series.
Two SIM cards can be used in a phone for various reasons. For example, some people use a second SIM card with a cheap smartphone tariff and a mobile internet tariff for their phone calls. Or a work SIM and a private SIM. Google will make significant improvements to this issue for the Pixel series.
It is planned For one of the upcoming updates that Pixel phones can use two SIM cards fully active at the same time or simultaneously Virtual Dual SIM Dual Active appears in current source codes. Even if the device has only one modem integrated, two SIM cards will be actively usable.
The function should come via an update to a virtual version
It looks like Google will start this feature with the Pixel 7, possibly with the first Android 14 feature drop (released in December 2023). However, this is currently only speculation as there is no official announcement yet. But it would be nice if there were no more restrictions in the future.
As of now, most devices support Dual SIM Dual Standby. Only one SIM is fully activated and can be used for calls and mobile internet.