Some time our phone auto update software we don't know get some issues example green line or other function not working so please change your phone setting
Go to setting >software update >close auto update & install thanks
or simply use A series that doesn't have Super AMOLED+ just "Super AMOLED", check GSMArena before buy a new phone
because even you don't update your phone, there's a low chance your S, Note, Z, or any Galaxy phone that has Super AMOLED+ screen will suffer green line, hopefully you won't suffer it
