What is the role of Receive incoming call option in SIM Card manager?

Receive incoming call option in Sim Card Manager of Samsung Mobiles helps to improve the service maintenance in the other SIM card and also improves the possibility of receiving an incoming call/SMS in the other SIM card when an active data session is progressing.

(Sim Card Manager options )
Know more about this option :

-If we are using data of SIM 2 using tethering, Network of SIM 1 will be disappeared if this option is not enabled.
-If we do manual search for other SIM, it may fail if the option is not enabled.
NOTE : This feature is applicable in Smart Dual Sim Samsung Phones.