Geschiedenis van "My phone is sim locked"

I dont know why, but it asks for a sim. When I place a sim card in, it gives an error of "Incorrect sim card". Along those lines. The phone itself visually looks fine. I read a message a while ago sent probably 13 years ago that said to take it to the service to get it fixed. However sony ericsson I dont think exist anymore.

Toestel:

Sony Ericsson W995

Status:

open