Phone hangs when swiched on.sumsung logo remines on the screen.and can't pick the network.

Some time if ur sim card is short then it hangs the phone u can try & justify by inserting other sims & checking ur phone hangs or not

I use LEO Privacy, too! A really useful app. It help to boost the system and other nice features. And I like its photo capture system to find out the snoopers. LEO Privacy Applock Boost Hide Android Apps on Google Play

LEO Privacy is probably one of the best privacy apps ever. Also there's this thing were it boosts your storage, which it does, but I still have to go in the settings to clear somethings. But an app can only do so much so I don't worry. You should get LEO Privacy.??