I have tried the phone lock but can still use the keypad - what if my phone is stolen?
Same Problem! Bought phone today- managed to do the Phone Lock bit for when the phone is Turned on/off, but I am unable to find the way to Get The Keypad to Lock. Had another Samsung Phone and went to Settings, Phone, Keypad auto-lock, but this option is not on the C3590. Let us know if you know how and I will let you know if I find a way!
Hmm.. Check Settings > Security or Settings > Phone if there are options for that.
Please let me know if you find any.