Something as simple as changing the date could brick your iPhone
More specifically, changing the date to January 1, 1970 will supposedly brick your device to the point that it cannot be recovered unless you manually disassemble the device and disconnect the logic board from the battery. It has been mentioned that this has something to do with the Unix Timestamp, although
It is hoped that Apple will come up with a fix for this particular bug soon, thus putting an end to the unrest of the customers once and for all. If you own an iPhone that features any of the aforementioned chipsets, make sure you steer clear of the Date and Time section of the device, at least until there's a fix for this.