Yes, Vivo S1 has dual 4G VoLTE support.
Vivo S1 offers superb value for money. The mobile has almost everything which you should have in an ideal mobile. However, we feel that the following can be disadvantaged.
However, the phone does offer full HD video recording and also offers fast charging via MicroUSB port but we still feel that above could be of good help to users.
Yes, Vivo S1 has an in-display fingerprint scanner.
Yes, Vivo S1 does have the Corning Gorilla Glass 5.