Activate any iPhone without original SIM or hacktivation

STEP 1: Download Redsn0w 0.9.6b6 for Windows and Mac, (Links at the end)

STEP 2: Jailbreak your iPhone using redsn0w

STEP 3: After you finish jailbreaking your device, start Cydia and add http://repo.bingner.com repository.

STEP 4: Then install “SAM” and “SAMPrefs”.

STEP 5: Launch Redsn0w 0.9.6b6 again, and select “Deactivate” option.

STEP 6: Navigate to Settings > SAM and click "De-Activate iPhone"

STEP 7: Connect your iPhone to your PC then launch iTunes, allow iTunes to activate your iPhone officially. You will see this message "iPhone is activated"

According to sbingner : If iTunes says invalid SIM, you will need to manually select the appropriate carrier under one of the methods besides "Automatic" and click on a SIMID.

STEP 8: Here's the final step, go now and unlock your device with ultrasn0w 1.2