If your phone hangs, you can try to use LEO Privacy's boost feature to speed up your phone. You can have a try with it.
LEO Privacy Applock Hide Safe Android Apps on Google Play
LEO Privacy is a very good applock, it cannot only protect your phone, but also boost your phone, it can also make your phone fly. Thanks for this applock.
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If u have a memory card in your mobile then try removing it first.If the card has some problem then the mobile works irracticaly(eg. hangs or restarts).
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LEO Privacy is the best app to use to boost your phone, you can have a try.
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