find lost iphone in room

Read this document for how to use the Find My app to locate a missing device or item --> Use the Find My app to locate a missing device or item - Apple Support

The chances of locating a device depend upon which features you selected in:

Set up Find My on your iPhone, Mac, and other devices - Set up Find My on your iPhone, iPad, iPod touch, or Mac - Apple Support

You would need to be using crowdsrouce data to get to the level of precion you desire unless you live in a sports gym.

See possible ways in this link --> Use the Find My app to locate a missing device or item - Apple Support

If you have another phone nearby, can you call your lost phone? Maybe a friend can help. If you are at a hotel, ask the front desk to call your phone.

If you enabled Find My on the phone, you can log into www.icloud.com/find from any browser and play a tone on the phone.