Side By Side Comparison of Idea ID 918 and Karbonn S15. Compare Processor, display, RAM, Storage and other features here. You can quickly compare Idea ID 918 and Karbonn S15 smartphones just by looking at their ratings and results showing "winner" and "runner up." There is also a short analysis comparing different features of Idea ID 918 and . You can also look at each hardware feature individually to perform your analysis while comparing mobile phones.