Nokia lumia 630 comes in 2 variant single sim and dual sim I had a single sim variant , it has 512mb ram 8gb rom and rear camera of 5mp, so I purchased it , it had windows 8.1 which was damn lame operating system no good apps even user interface was so boring so I upgraded it to windows 10 which made it awesome . awesone features like home screen icons apps got much better , the time I bought it and the time till I sold it , it never got hanged never, it was the best phone some how it had few drawbacks like it had only rear camera no front facing camera , it had small screen 4.5 inch , and it had only single sim option , soo hardware vice it wasnt that good but performance was damn awesome , so thanks for reading , if my review helped you so please mark my review as useful