1.firmware version check
Dial *3001#1234#* on the Emergency call.
2.Wifi and iTunes
Also, make sure you use the right version of iTunes. For example, if your firmware is 1.1.4, you have to use iTunes 7.6.
3.restore and unlock
As to unlocking, wow, tons of materials on the internet. Use google please to get what you want. If you are lost, you can contact me.
Add http://iphone.freecoder.orge/rep to your Installer‘s Source and then install the right version of iCosta from Categories->Localization. Reboot the iphone and you are done.
5.some setting adjustments for local
Settings->Date&Time: Beijing,China, Settings->International->Asias Font:Chinese, Settings->Auto-Brightness:Off, Settings->Sounds: All Off except Calendar Alerts and Lock Sounds(my choice, yours up to you);
Weather: add your local city and change the display unit from F to C.
7. done. You have the coolest toy on the planet now. Congratulations!!