I'm planning to develop an application to reduce call expenses for users. The basic idea is to show their call durations on sorted contacts. For example, my app should shows a list of phone numbers, with the most called (most time duration / most number of times dialled ) at the top of the list. The other part of the application is to suggest the user to get certain voice call plans from the service providers, which I can manage to develop. But for the first part, I mean accessing the details (every little bit of information about calls) of the call-log, I need your help. How can I do this most efficiently? All sort of suggestions are welcome.
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