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...
1. Download this zip Google it as it's banned from xda for the ability of imei change
2. Extract it and install QPST from that zip
3. Open the caller app and type in *#*#8778#*#* (it should go off the screen after you type in the last symbol "*"
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...