saw on a website that there will be no updates for c series phones as they lack some hardware functions which are a must for nougat..is this true

Hello friends,after the main flagship phones of shamesung,the s series and n series which has a dud note 7it's the c series phones which tops in the features...But instead of buying these 36000 c9 or other c series..the j series and on series got th...

When ever I end a call the phone does not light up..The screen remains off.is this a sensor problem or some software problem