Turning off WhatsApp data on your iPhone can be beneficial for a number of reasons:

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Turn off Media Auto-Download: To further reduce data usage, you can turn off media auto-download by selecting the "Media Auto-Download" option and choosing "Never" for both "Voice Messages" and "Video Messages".
Enable Low Data Usage for Calls: If you frequently make voice calls on WhatsApp, consider enabling the "Low Data Usage" option to minimize data usage during calls.
Adjust Call Settings: You can also adjust your whatsapp number database call settings by going to "Settings", then "Calls", and selecting "Low Data Usage" to reduce the amount of data used during calls.
Restrict Data Usage: To limit data usage even more, you can go to your iPhone settings, tap on "Cellular", scroll down to find WhatsApp, and disable the app from using cellular data.
Why Should You Turn Off WhatsApp Data on iPhone?

Data Conservation: By disabling data usage, you can conserve your mobile data for other applications or activities.