No. iTel S41 does not have a hybrid sim slot. It has 1 dedicated slot for MicroSD card and 2 dedicated sim card slots.
iTel S41 dimensions are 144 x 72.4 x 8.3 mm.
Yes, iTel S41 does have VoLTE support.
Yes, iTel S41 does have the LED flash with the front camera.
Yes. In fact, iTel S41 has ring indicator which blinks when you get a new notification.