Difference Dualsim Adapter and active Bluetooth Dualsim

A dualsim adapter fitting into a phone enables the user to seperate calls.
Classic examples:
1.You have a business phone and you are not allowed to make private calls.
So you switch to your private number.
2.You have bad network coverage: YOu switch to another carrier
3. You travel inbetween different countries. You switch to the other carrier
Only one Sim active at a time

Difference with SocBlue 830 active Bluetooth Dualsim case or SocBlue A820
It is a bluetooth connected dualsim device with all sims active at the same time