Click on this link for general information about what to do "If your iPhone, iPad, or iPod touch is lost or stolen" --> https://support.apple.com/HT201472
- The Find My service is the only recovery feature Apple offers. It MUST be set up before the device is lost. If you did not do that it is too late to do it now and there is no other feature Apple offers that can help you find it.
Click on this link to read how to "Use the Find My app to locate a missing device or item" --> https://support.apple.com/HT210515
The chances of locating a device depend upon which features you selected in:
Set up Find My on your iPhone, Mac, and other devices - https://support.apple.com/HT210400#enablefindmy
Click on this link to learn what you can do 'If Find My iPhone or Find My iPad isn't enabled on your missing device' --> https://support.apple.com/HT211207
If Find My iPhone is offline or not working' click on the link to 'Get help when you don't see your device listed, or you see an unexpected device or an alert that says your device is offline.' --> https://support.apple.com/HT204233
Concerning your data, read/watch these links -->
Click on this link to discover how to 'Restore your iPhone, iPad, or iPod touch from a backup' --> https://support.apple.com/HT204184
or watch this video if you're using a Mac to do this:
https://www.youtube.com/watch?v=Jbp3gGTQygg
Related information:
Use iCloud to transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch --> https://support.apple.com/HT210217
Some things are not stored in a backup. Click on this link and read "About missing information after you restore your iOS device with iCloud Backup" -->
https://support.apple.com/HT203768