There are several ways to find your lost Android phone:
Use Google's Find My Device feature: This is a built-in feature in most Android devices. Go to the Find My Device website and log in with your Google account. You'll be able to see the location of your phone on a map, as well as lock it, erase data, and play a sound.
Call or text your phone: If your phone is nearby, you can try calling or texting it to see if it rings or vibrates.
Use a third-party app: There are several apps available on the Google Play Store that can help you locate your lost phone. Examples include Find My Phone, Prey Anti-Theft, and Cerberus Anti-Theft.
Contact your carrier: If none of the above options work, you can contact your carrier and ask if they can locate your phone using its IMEI number.
Remember, it's always a good idea to have some kind of tracking or anti-theft app installed on your phone before you lose it. That way, you'll have a better chance of finding it if it gets lost or stolen.