Tracking stolen iPhone 7

So the gf's iPhone got stolen out of her pocket a couple hours ago. Tried logging in her Apple account, but they tried sending a verification code to her old phone number, which is in the US and doesn't work in Europe, where we are now. They're supposed to be sending a text with recovery instructions in 24 hours or something.

Reported it to police and gave them the IMEI but I'm yet to hear of the cops actually finding a stolen phone with this. Tried calling her number but it says it doesn't…

Tracking stolen iPhone 7