Hiw can i find the last location that my iphone was stolen?

Hello Omidvar,

Thank you for using Apple Support Communities. Based on your post, your iPhone was stolen but it doesn't show it's last location. We'll do our best to assist.

You came from a great resource for this issue: If your iPhone, iPad, or iPod touch is lost or stolen

The Find My app would need to be set up prior to the device being lost or stolen. If it wasn't set up: If Find My iPhone or Find My iPad isn't enabled on your missing device

As stated here: Use the Find My app to locate a missing device or item

"If your device is powered off, the battery has run out, or more than 24 hours has passed since its last location was sent to Apple, you can't see your device's location."

It would be best to follow the first resource and make sure to contact your local Law Enforcement.

Wishing you the best, take care.