How to find my silenced iPhone?

I have tried the Find My iPhone thing, but it needs prior setup before losing it and being the genius I'm I didn't do that. I have been searching for my phone for the past 2 hours and I have retraced more times than I can count… I've tried calling it but I'm pretty sure it's on silent… Is there any way I can make it ring or something without needing the actual phone to install something onto it?

Please help me! I need it as soon as possible, I have something super important on my phone I need fairly quickly!

When you're looking for it try to look right to left this time. It will make you more focused so you'll find it quickly.