Yes, iTel S41 does have a memory card slot.
Yes, iTel S41 is a VoLTE supported phone. You can enjoy Jio video calling easily.
No. iTel S41 does not have a hybrid sim slot. It has 1 dedicated slot for MicroSD card and 2 dedicated sim card slots.
No. iTel S41 does not gorilla glass but it's display is scratch resistant.
Yes, iTel S41 does have the LED flash with the front camera.