Yes, Vivo S1 does have a 3.5mm headphone jack.
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.
No. Vivo S1 does not have a notification light but it does have Always-on display.
Yes, Vivo S1 comes with 18W fast charger in the box and the mobile has fast charging support.