Anyone know the figures that you used in your password with the stains on your screen, then the chance that he does not recommend the combination when you use the same number twice. He does not know which of these three figures half time in the combined return. This should be 36 different combinations are tried, instead of the usual 24 (4x3x2x1). Still not many, but only a few times when you can try to enter the combination. With the iPhone because you can set all your information is deleted after ten failed attempts. The trick only works if you use a number twice. Use two digits twice, then the number of possible passwords to just 14.
Do not have a password set on your iPhone, you can do this from the settings screen. From here go to General, and then click the option button code lock. Here is the code set to determine when and whether it should introduce the iPhone to erase itself after ten failed attempts.