Does the name Sheriff Hashim remind you of anything? Well, if it doesn’t have a look here. Sheriff Hashim, is an iPhone hacker who managed to find a new exploit for baseband 05.12.01. Sheriff once again rocked with a new discovery, lets you activate your iPhone 4, 3GS and 3G without the official SIM card. This new discovery is very useful for those who got shipped unlocked iPhone 4 and still looking for jailbreak / unlock. All you need is a phone book card, usually used to transfer contacts from one phone to another number. You can bu phone book card from your local mobile repair stores or e-bay, amazon etc.
Sherriff also posted a video demonstrating of his finding, check the video after the break.
Needless to mention if you remove the SIM card your phone will be locked again, but hey you can use your iPhone as iPod until a new solution available in the wild.
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