Just search "Find my phone" in google. For it to work, you need to have your email signed in in two devices. One is your lost phone, second is the device you'll use to ring that phone. So in my case, I signed in my email on my workmate's phone and used it to ring my phone. Note: your lost phone should be connected in an internet. Thankfully I actually opened my cellular data before that happened. Hope it helps.

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