I buy a used 4Gb iPhone, there was installed AT&T sim card and the phone has been in use. There is 1.1.1 firmware inside.

I unlock the phone with anysim and it works great. But when i connect the phone on itunes i get error: There is no carrier that supports the installed SIM Card in the Iphone

iTunes version is 7.5 and i try also pc/mac version 7.4.1 and 7.4.2

If i try to connect iTunes with AT&T sim it says that the sim card number is not valid..

Any idea what i can do now? Or is this phone dead.. i can call but i can't copy a music on it.

I could be completely wrong on this, but I believe that you need to edit the Operator.plist on the phone and modify one of the supported carriers by overwriting MCC-MNC of the supported carrier with the MCC-MNC of your carrier. You can find the MCC-MNC in the field test app.

where i can find that operator.plist ?

i have ssh installed.

i try to edit carrierMap.plist, and add my ISP code there, it looks now like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>24421</key>
<string>ATT_US.plist</string>

</dict>
</plist>

but it not work..