Business Insider: 7 ways to find the IMEI number on your iPhone
To find your iPhone's IMEI, you can use the Settings app, Phone app, Finder, or iTunes. You can also find the IMEI in the SIM tray of your device. If you don't have your iPhone with you, you can find ...
Android: Make sure " Find My Device " is enabled on your phone. This is usually under Security Settings in your phone's main settings menu. You'll also need to make sure Location is turned on. iPhone: Enable " Find My " in your iCloud settings. This is usually under your name at the top of the Settings app, then tap "Find My."
To help you find offline items with Find Hub, if you don’t have one, set a PIN, pattern, or password on your Android device. Learn how to set screen lock on your device.
Be ready to find a lost Android device - Google Account Help
Tip: To find, secure, or erase your Wear OS device, connect it to Wi-Fi or mobile data. Be ready to find a lost Android device.
By default, your Android device stores encrypted recent locations with Google and participates in the Find Hub network, a crowdsourced network of Android devices that uses end-to-end encrypted location information to help Android users find their lost devices.
Find My Device can now help you locate devices, even if they're offline by encrypting and storing your device's most recent location with Google. See the article Here