Considering the little computers that we carry around in our pockets (or purses) all day help us with our email, internet access, personal GPS recorder, social networking, (very) personal journals and once in a while also act as a phone, it makes sense for us to want to protect all that data. The easiest way to keep our phones from prying eyes is to switch on the passcode functionality.
Of course this presents itself as a Catch-22. On one hand we know if we were to forget our phone at a coffee shop or a public library (or even worse lose our phone), it would prevent someone from getting to know pretty much everything there is to know about us. On the other hand it also prevents a good Samaritan from returning the phone to us in the event they find it.
Furthermore, locking the phone also obstructs emergency services from getting a contact person in the event of an unfortunate accident.
So what does one do?