It is a critical problem when you lose your phone in silent mode.There are few apps on the Play store that can help you track a phone, but to keep things simplified, I would only mention two applications today.
Treehouse - Ring MyDroid
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The Treehouse - Ring My Droid application has a SMS-triggered alarm system. When you install the app, you are asked to set a Key Phrase. Whenever you forget where you left your phone and can’t find it because it’s set on silent mode, just use another phone to SMS your Key Phrase to it.

Once the phone receives the Key Phrase as a SMS message, it starts to ring even if it is kept on silent mode! Now just follow the sound and find your phone. Easy!

Cerberus antitheft
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Cerberus is a complete anti-theft application, the best protection you can get to recover your misplaced, lost or stolen Android device. It's not just a "find my phone" app or a phone tracker (locator), Cerberus has many unique features that make it the perfect app to locate your phone or tablet, identify the thief and get back your device.
It has three ways to protect your device.
These are the "3 heads" of Cerberus: http://www.digitalbog.com/2017/06/how-to-track-a-phone-on-silent-mode.html