Passcode Security Hole Found – Save SHSH Files Now!
A a major security flaw in iOS 4.1 has been found, this hole allows you to make phone calls even when phone is locked.
There has been a lot of talk about this new security hole between the dev team members and other members of the community. No doubt Apple will release a firmware update to patch this hole. This means, if you require a jailbreak or unlock, PLEASE save your SHSH files now, and do not update!
The hole which allows you to access your device without entering a passcode is done using the Emergency Call screen. When your device is locked with a passcode tap on the Emergency Call button, then enter a number such as ###. Next tap the call button and immediately hit the lock button. It should open up the Phone app where you can see all your contacts, this will allow you to call any number.
For a simple explanation on what SHSH files are and why they are useful, click here. Also, for a full guide on how to save your SHSH files using TinyUmbrella click here