Yes, Vivo S1 has dual 4G support. You can use 2 4G network sim cards at the same time.
Vivo S1 standard packaging box contains - Vivo S1, Earphone, USB Cable, USB Power Adapter, Protective Case, Protective Film (applied) and a user guide.
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.
Vivo S1 has a weight of 179 grams.