Can I use CX Sales Mobile when I am not connected to Wi-Fi and I haven't got a cell phone signal?

Yes, you can view, create, and edit records in the app even when you're offline. When you lose your network connection, a message is displayed to indicate that you're working offline.

At the top on the page, a banner displays how many updates will be synchronized when you're back online and also how long it's been since you last synchronized your data.

When the network connection is restored, the application automatically synchronizes the updates you have made on your mobile device to Oracle CX Sales. Alternatively, you can manually sync the records by tapping the offline banner at the top of the page and then tapping the more icon in the Pending Sync page.