Celkon Campus A35K was launched in 2014. I bought it a year ago in Celkon mobile shop.
Its worst phone because of no more RAM. It has only 256 MB RAM which very less. I hate this phone because sound quality is not so good. Also can’t download any apps from Playstore and says no more space in your phone memory. Camera quality is worst. Totally waste of time. Browser is very slow. The biggest problem is about battery. It has only 1400 mAh battery which takes 4-5 hours to full charge. And it has only 1.2 Ghz dual core processor which is not so fast. Its totally worst phone. And it can’t upgrade into android Lollipop 5.0