What's the purpose of being able to choose sim cards in a dual active sim phone?

[cjva15]

My Samsung Galaxy Grand Neo (Dual Sim) has an option in the notification drop down to choose which Sim card to use or "make active". I think this a vestigial function because this phone makes BOTH sim cards active at the same time. It's practically useless. Am I right? or does this function have some purpose that I don't know about?

 

[Indoler]

My Samsung Galaxy Grand Neo (Dual Sim) has an option in the notification drop down to choose which Sim card to use or "make active". I think this a vestigial function because this phone makes BOTH sim cards active at the same time. It's practically useless. Am I right? or does this function have some purpose that I don't know about?

I really don't know, but maybe it also depends on what (kind of, if applicable) SIM cards you have installed, on what kind of contract (from a technical POV), and what kind of provider/telco/ISP (from a technical POV) you have.

And of course: what version of Android runs on that device?

 

[cjva15]

I'm not sure about the contract but its different networks. And my device is running on android 4.2.2.
It's funny because there's even a widget available to you can "choose" a sim card on the homescreen--and its practically useless because both networks are working at the same time so there's really no need to choose. Unless this has some function that i still have to discover