I'm sorry about the issue. What's the model of your phone?
Was the kindle app working fine previously on this phone?
Please try the following:
- Press and hold the Power on/off button on the phone and shut down / restart the phone, and check.
- Sign in your Amazon account at the website below:
, and make sure all your purchased books are there first
, then click on the Action button / icon in front of each book you want, then select the option Deliver, then select your phone device, then select Deliver.
Please reply at the box below to continue troubleshooting. Thank you.