Earlier quoted context omitted.
Almost all mobile phones come with dual-sim support. Some with the second sim tray being utilized as an External memory card slot/Sim card slot. This is pretty common all over SE Asia.
I’m asking about the need for 2-3 SIMs, not the capability. They’ve had them on phones for a while and it should become obsolete with eSIMs. The new iPhone features a physical SIM and an eSIM.
Source: Indonesian with family that needs two-sim cards phones.