Same. It does automatically connect to T-Mobile, but the search screen shows nothing in the list and then shows that error toast message.
I had the same problem when I chose all the GSM and WCDMA bands, it just keep searching and when I tried t...
That code is used for changing the CSC.
You can use my app instead: Phone INFO ★Samsung★
Go to the Menu > Other Tools > CSC Changer.
gotit ith your app , thank you...