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FAQ for Samsung Mobile Device. Find more about 'How can I customise the lock screen on my Samsung Galaxy Mega?' with Samsung. The good news is that you can manage your notifications right from the Lock screen. Note: Available screens and settings may vary by wireless service provider, . The Lock Screen appears when you press (don't hold) the power button on your Samsung handset, as shown below. img14.jpg. (Representation . Setting the Lock screen background.