With this mobile app and the s2uFramework for Odoo installed you have always access to your customers/crm. You can communicate with them like you do in Odoo. See your open tasks, write your timesheet on the work you did and send messages and/or notes to the task followers. You also have access to your inbox and the channels you are registered to. And with the dashboard you know whats happening within the company.
The s2uFramework runs on Odoo version 11.