Yes, Vivo Y17 does have a 3.5 mm headphone jack.
Yes, Vivo Y17 does have the hybrid sim slot. But you do not require to worry about the internal storage. As the phone comes with huge 128GB internal storage.
No. Vivo Y17 does not have the front camera flash but it does have the display screen flash, just like an iPhone.
Yes, Vivo Y17 does have the face unlock support. In addition, the mobile also has a fingerprint scanner.