No. Vivo S1 does not have auto call recording. But you can use Apps available on the Google Play Store.
Vivo S1 has a weight of 179 grams.
Vivo S1 has 6.38 inches of AMOLED Full HD plus display. It is further protected with Corning Gorilla Glass 5 level of protection. The mobile has a 90% screen-to-body ratio and has 19.5:9 aspect ratio. Vivo S1 offers 404 PPI of resolution.
No. Vivo S1 does not have any association with Dolby sound.