How to find the lost device? I lost my iphone13 last sunday in which the find my iphone option was not turned on? please help

Hello ~ Take a look here and if Find My was not activated there are still things you can do:

If your iPhone, iPad, or iPod touch is lost or stolen - Apple ...*

*If Find My iPhone or Find My iPad isn't enabled on your missing device - Apple Support

~Katana-San~

If you did not have "Find My" enabled for your iPhone, you are not going to find it. Are you sure that the option was off? Log into icloud.com/find with your Apple ID and password and see if it shows there.

Hello again ~ If you didn’t have Find My turned on …it cannot be tracked. You will have to locate it the old fashioned way by looking for it. The information I posted was to do what you could to protect your information.

~Katana-San~

Unfortunately, you will have to try to find the phone the same way that you try to find your car keys when they are lost.

Unfortunately, if the Find My option was not enabled, you will have to look for the phone in the same way that you look for your car keys or wallet if they are lost.