No doubt, your phone must be something very valuable for most of you. If so, you will want to keep it away from thieves. HandsOff is a handy app that will help you with that.
HandsOff is a simple alarm tool that will detect possible theft of your N900, using light and proximity sensors. Just type in a PIN-code and, well, press the big red button on top.
After armed, as soon as your N900 leaves the area where it’s supposed to be, a loud alarm will notify you about it right away, and might prevent a theft. Surely, the alarm won’t stop, unless a proper PIN-code is entered. You can also set your own alarm sound and sensitivity, so you can carry the phone in your pocket. You might want to tweak the settings a bit, until your desired settings are discovered.
Even something that relatively small can prevent a theft, so if you’re paranoid, or just want to keep your N900 safe, you should probably try HandsOff.