Yes, Vivo Y83 is a true 4G VoLTE phone.
No. Vivo Y83 has 2 slots dedicated for SIM card and a separate slot for the MicroSD card. You can expand phone storage by up to 256GB with the help of the memory card.
Yes, Vivo Y83 does have the 3.5 mm headphone jack.
No. Vivo Y83 does not have the NFC support.