Hello, I just received my Redmi 3S (3gb RAM 32Gb Rom) and I was offered MIUI update which is proceeding as I type this texte to the latest stable release. However even before I could not figure out how to activate/deactviate the built-in GPS?? There is no icon next to Wifi and data icons, like on other Android phones, and no GPS option in the "Parameters" screen. How to do it please?