DESCRIPTION

Many Xiaomi Phones has received MIUI 9 Global Beta ROM 7.10.12 and Redmi 3s and 3s Prime are on that list too.You can check out the full list here

If you want to install GApps On MIUI 9 then this step by step guide will help you >

How To Install GApps On MIUI 9 (Playstore On MIUI 9)

※Please make a backup of your device before installing or updating ROM