For some reason I can't always answer an incoming call by swiping up. I do it several times and the little green circle moves up with my finger but then back down again and the phone keeps ringing and I miss the call. Then sometimes it does work and I swipe up once and I answer the call. I can't figure out what is the problem. If I'm doing something wrong sometimes or if it is a glitch in the software or a screen sensitivity issue...I don't know. Could it make a difference if my finger is cold or dry? Sometimes my hands are cold, sometimes dry, sometimes sweaty. Does it matter how much pressure I apply to the phone when I swipe up? It's a UMX phone. Is there a way to switch from swipe-up to tap in order to answer a call? I could not find anything in settings that had to do with answering a call.