I had my S22ultra stolen(of course after canceling insurance) by a bad person. Go to my tmobile store to discuss what used phone could be ported over. Manager convinces me to by A15 "only difference is camera quality!@" and I bought it. My service, app load speed, ability to have more than one open and all around functionality has been on par with my old coffin phone! So angry.
I think the companion app on Samsung phones was discontinued, but it had something to do with file transfers and linking your phone to Microsoft windows. Samsung Phones have "Link to Windows"(in your Quick Access panel). If you're referring to "Companion Device Manager," It's a legitimate system app.
