You can't. You need a registry of all sim card owners and that can only be found with ethiotelecom. And the only people they're gonna give access is to the police.

https://instagram.com/cyberaid_?igshid=1mc3a7xmffz5r Contact him(indian hacker) but you have to pay him first

Ye selkehn serial number yemtakew kehone tele bethede track liyaregulk yichlalu gn ahun tetewal meseleg am not sure

Spysetup.com

If you have samsung account and setup find my phone, you can look up it's location, battery status, backup your data, and just control your phone remotely men. But if you hadn't set it up, I'm sorrymen