How to put code in iphone to unlock - Apple iPhone 3G

There is no "code" but try redsn0w. Since it is frowned upon, I can not give you a link. Speaking of which, have you seen Google? Man, you can find anything. Assuming you did find a copy of redsn0w, you can unlock it by:

Step 1. Downloading the above mentioned software


Step 2. Extract redsn0w-win_0.7 to C:


Step 3. Locate your 3.0 firmware, and copy it to C:\redsn0w-win_07


Step 4. Open run, then type cmd.


Step 5. Type in cd C:\redsn0w-win_07


Step 6. Type redsn0w.exe (the name of the ipsw).
Eg for Step 6. redsn0w.exe iPhone1,2_3.0_7A341_Restore.ipsw

Step 7. Wait for a message to come up saying please connect your iPhone into DFU mode.


Then connect your iPhone to the computer if you havent already done so, and hold down the Power and Home buttons for 10 sec. (If the apple screen comes up you have gone too far)


Then let go of the Power but keep holding onto the Home button. Hold it for at least 30 sec or until it reconnects to the computer.

Step 8. Go to the Command Prompt window and press enter.
And then when your iphone restarts, you can disconnect.