Girlfriend has my spare Galaxy s3. It is on a GoPhone plan now. She changed the 4 digit passcode and now I'm locked out. She will not give it back and I have no acces to the account. I have an iPhone 6plus and also an iPad. I know the number and the IEMI number to the Galaxy s3. How can I track its location?
Do you want to reason with her or report her to the Police for stealing it? There's no other way unless you pay the bill for it. If that's the case, tell the Service Provider it's been stolen and to block any further calls or data transfers. You're responsible for any made to that time.