How can I let people read messages but not delete them in mobile phone?

When I put my mobile phone at home or at office I want them to read messages but sometimes they delete some messages, how will I be able to let them read the messages but they shouldn't delete them? what about call records is it possible to put password in order to not delete them? My phones are Nokia and Samsong T619How can I let people read messages but not delete them in mobile phone?Not possible.