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No. Vivo S1 does not have the FM radio support.
Vivo S1 is available in 2 color variants - Diamond Black & Skyline Blue.
Yes, Vivo S1 has dual 4G VoLTE support.
Yes, Vivo S1 has dual 4G support. You can use 2 4G network sim cards at the same time.
Yes, Vivo S1 does have a 3.5mm headphone jack.