Have you ever wished to protect with a password some of your applications, messages, contacts and so on? Well,
Lockdown Pro will do it for you. You can choose between a numeric or an alphabetic password, and that's about all. Enjoy.
It can be purchased for $4.99 from Cydia or for free (the cracked version) also from Cydia.
Just check it out Start from $0.01 for real.