Sherif Hashim tweeted that he has found a way to activate iPhone without the original SIM card.He also found the exploit to unlock baseband 05.12.01 and baseband 05.13.04.
Sherif Hashim has discovered that you can activate iPhone 4, iPhone 3GS, iPhone 3G with a PhoneBook SIM card. A PhoneBook SIM card is used to transfer your phonebook contacts from one phone to another. You can purchase PhoneBook SIM card from Radioshack, Mobile Phone Shops, or online. iPhone 4 users need to cut the SIM to micro-SIM card size.
He has posted a video on how to activate iPhone 3GS, iPhone 4 and iPhone 3G without official carrier’s SIM Card.The video is given below.