The main reason Netflix won’t let you download on cellular is that the app defaults to a setting to protect you from accidentally using up your mobile data plan . Since a single high-definition movie can consume up to 3GB to 6GB of data, this safeguard is active by default on most devices.
Note: If you see a "Waiting for Wi-Fi" message on an existing download, you can often tap to force it over cellular. Other Reasons Your Downloads Might Fail
and tap the My Netflix icon in the bottom right corner.
Tap the (three lines or your profile icon) in the top right corner and select App Settings . Scroll down to the Downloads section. Toggle the switch for Wi-Fi Only to OFF .
To fix this and start downloading using your mobile network, you must manually adjust the app’s internal settings. How to Enable Cellular Downloads on Netflix
If you've disabled the "Wi-Fi Only" setting and still can't download, consider these common roadblocks: 1. Device and OS Restrictions How to download using mobile data instead of Wi-Fi