Yes, iBooks can function normally while not connected to the internet.
As long as you have the book(s) present in the iBooks app before you get out of coverage you will be fine.
If you are out of your coverage area and connect to another network, or roaming, you might have additional expenses for using another network.
Does reading a downloaded book use data?
Data Usage. Before you can read a book using the Kindle app on your iPhone, you need to download the app, and it is this download that could affect your data usage. If you are using the cellular data network, on the other hand, every book you download counts against your data limit.
How can I read books offline on my iPhone?
Still Not Able to Download Books for Offline Reading?
- Check your connection. Settings > Wi-Fi.
- Close iBooks App.
- Download a free book.
- Update Apps.
- Restart Your Device.
- Force Restart Your Device.
- Update to the latest iOS version.
- Sign out and back into iTunes and your Apple ID.
Can you read iBooks in airplane mode?
Yes you can read them on an Airplane. Books downloaded to the iPad need no internet connection at all for you to read them. Beyond the iBooks, if you want to test what will/won’t work on a plane, go into the settings and put your iPad into airplane mode. Then you know just how it’ll work when you’re on the plane.
Do downloaded Kindle books use data?
Once book is downloaded to Kindle app on a device it does not require wifi or data when reading.