1) Can store Contacts
2) Can call Contacts using your default call application or any other installed call application
3) Can send messages by using default message application
4) Can edit existing Contacts
5) Can Delete Existing Contacts
More than one user can use this application on same phone each user contacts are store separately as every user will have unique id.
User id is unique within the app.
Any Suggestion or if you find any errors in app feel free to mail me with your device details so that we can rectify it.