Play sound even if on silent find iPhone

Please review this document Play a sound with Find My iPhone on iCloud.com - Apple Support

If I understood your question correctly then it appears that you would like to know if FindMy can play a sound on a phone even if the phone is in Silent Mode. The answer to your question is YES.

Axel F.

If you use the Play Sound button in Find My iPhone, it will sound on the iPhone even if in Mute/Silent mode.