A few months ago, Vivo brought in one of their mid-range smartphones, the S1, to the Philippines. While it faced some fierce competition in the market, it was a pretty good start for the S series. Recently, Vivo launched another member of the S series, the S1 Pro. Check it out!
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https://www.yugatech.com/mobile/vivo-s1-pro-hands-on/#sthash.j9gXmvvw.dpbs#7kU8HVzqis6DLUlP.97
