Screen keeps lighting up while carrying or in pocket-why?

[AC Question]

Just got s5 as stolen phone replacement. Why does my screen keep lighting up while carrying it in my hand or in my pocket? What setting do I need to adjust?

 

[Annoymous guy in the bush 33]

You might be around a free wifi hotspot and it wants to connect even if wifi is off you might be getting a notification or something like a car key is pushing the power on button or if it detects a touch on the screen some phones do