Yes, you can use video calling apps like WhatsApp or Google Duo on this phone and can enjoy video calling to your near and dear ones.
Moto C is made of Polycarbonate material.
Yes, Motorola Moto C does have front camera flash.
No. Motorola Moto C does not have hybrid sim slot. You can use 2 sim cards and 1 MicroSD slot at one go.