I am a big fan of Nokia mobiles sience long due to its durablity and ease of acess.
I have been using Nokia Lumia 630 DS sience 10 months now. It is a very good phone with a solid build. It is loaded with windows 8.1 which is a very good os and comes with preloaded Microsoft apps such as Ms-Office and other apps. Camera quality of the phone is awesome, it takes descent pictures and comes with manual control. The only problem I faced was app crash and a bit of lag while opening apps.
Overall this is a very good phone and I recomend to buy this.