I have an application to be made which uploads phonebook and sim card contacts to a web server.
I have to upload the updated contacts to the web server periodically.
Now my problem is how do i come to know whether any contact in the phonebook have updated or edited or deleted.
As i have to upload the contacts, only which are modified, not all on the successive uploads.
Have any one worked on such kind a project. Any help related to the topic will be highly