I haven't been using a lock code on my phone. Do I really need one? How long should it be? 6 numbers not really enough any more. The default for most phones is a 4 digit lock code that's laughably simple to break into. Honestly people can look at the grease spots on your phone and know what your 4 digits are. Then it's a very quick process of guessing what order you use those 4 digits. So 4 digits not enough, 6 digits really isn't enough. These days given the availability of software that will break into your phone you need to at least use an 8 digit pass code if you're concerned about the security of the contents of your phone. I know you say to yourself I'm never anywhere where I don't have my phone with me and if I left it somewhere I would immediately know. Sure you can believe that if you like, but put a pass code on it, sooner or later you'll be glad you did.