Yes, Vivo Y93 is a dual 4G mobile phone. It is dual VoLTE also.
No. Vivo Y93 does not have the in-display fingerprint scanner. Fingerprint scanner of the Vivo Y93 is located on the back side of the phone.
Vivo Y93 comes with 2A output power adapter, which is slightly faster than the normal chargers supplied with other mobile phones.
Yes, Vivo Y93 does have the portrait mode in both sides of cameras.