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Vivo S1 (1907) Questions & Answers

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No. Vivo S1 does not have the 5G network support. It works on 2G/3G & 4G GSM networks. 

No. Vivo S1 does not have the FM radio support. 

No. Vivo S1 does not have any association with Dolby sound. 

No. Vivo S1 does not have auto call recording. But you can use Apps available on the Google Play Store.