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You probably, reset your phone setting, and if you were jail broken,
2 many factors would affect your device and cause this problem,
1-if you were unofficialy unlocked your device by ultrasn0w or Sam .
2-you may have updated your firmware via iTunes and that would lock you phone and cause that error, you need to searh iclarified dot come or modmyi forum
You must have the phone jail broken and unlocked to use a different carrier than the manufacturer intended. If you have an updated baseband on this phone (that ultrasn0w wont unlock) then it can't be unlocked without updating to IPAD baseband and custom firmware. Phone must be jail broken.
If you have Apple iPhone 3G the easiest way is to upgrade it to version 3.0 and than run RedSnoW ( download it from here http://blog.iphone-dev.org/post/126908912/redsn0w-in-june ) to jail break it Than run CYDIA and add UltraSn0w repository repo666.ultrasn0w.com
install UltraSnow from here and reboot your phone it will be jail broken and working , I did the same on mine and had tried it in China , Dubai and Pakistan
If you like the solution a rating will be most welcome Farhan www.senseapplied.com