The application gives a tag to incoming and outcoming calls, it remind you of the content conversation. An important feature is the fact, that mark is added at the end of calls and use standard call log with easy and familiar interface. The tag is applied only for numbers which are not in your list of contacts. The app is in the autorun and continue to work in the background. Have small size and does not require a lot of resources phone.
What else? Try to make a call ;) Thanks.
Tested on Samsung phones S2, S3, S4, S5, S6