Note:
If both cards are activated, you can receive calls and messages on each card.
However, if you are on a call using one card, the other card cannot be used to receive new calls. Unable to disable all SIM cards at once.
Dual SIM card trays feature 2 SIM card slots, where a hybrid SIM tray features 1 SIM card slot and a hybrid slot. A hybrid slot can take either a second SIM card or a microSD card for expandable memory, giving you the flexibility to choose between a second SIM card or extra storage.
You can check by removing the SIM card tray and seeing how many slots it has and how the second slot is labeled, if it says SIM2 it's a dual SIM, if it says SIM2 microSD it's a hybrid.