Take a look at the tweak AppLocker ($.99, USD). It works fine on my iPhone 4S. You can lock folders too (in addition to apps). Plus, it has an SBSettings toggle so you can turn it on/off whenever across the board.
Take a look at the tweak AppLocker ($.99, USD). It works fine on my iPhone 4S. You can lock folders too (in addition to apps). Plus, it has an SBSettings toggle so you can turn it on/off whenever across the board.