I lost my iPhone 11

Click on the following blue text to learn what you can do If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

(Nobody here can help you with this, we’re other users like you, and not Apple, nor your carrier.)

kazeh114 wrote:

Which number can be helpful ?

Via Find My, if that was enabled before the iPhone was lost or stolen.

Find My cannot be enabled remotely.

Otherwise, check with your carrier.

Again, click here: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

It can't be tracked with that number.

Look on Find My on another of your Apple Devices or log into your icloud.com account on a computer

No number can be used to track it.

Find My is the only method.