How to Unlock iPhone 3G

Step 1

Launch the Cydia from your iPhone SpringBoard.

Step 2
Go to Manage tab available at the bottom.
Then Press the large Sources button.

Step 3
Press the Edit button available at the top right corner.
Then Press Add button available at the Top left side of the screen.

Step 4
Enter http://apt9.yellowsn0w.com as the Cydia/APT URL and press the Add Source button.
When adding Source process is complete, Press the big Return to Cydia button.

Step 5
Hit the Done button at the top right.

Step 6
Now Tap to select apt9.yellowsn0w.com from the list of sources.
Now select Yellowsn0w from the list of available packages.

Step 7
Now press Install button from the top right corner.
Then press Confirm from Top Right to Begin Installation.

Step 8
When you're done with the installation, Press the big Return to Cydia Button.

Step 9
Press the Home button to return to SprinBoard. Then Hold down the power button for 3 seconds, a Power slider will appear . Slide to Power OFF your iPhone 3G.  Now again turn your iPhone 3G ON.

Enjoy the SIM of your Choice in your unlocked iPhone 3G.

* USEFUL HINTS *

If iPhone hasn't detected your new carrier, try these:

• turning off 3G
• Toggling the Airplane Mode ON and OFF

Still out of Luck? Try reinserting your SIM card or insert a new SIM. or try resetting your Network Setting from Settings > General > Reset Menu

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