Unable to download WhatsApp to my iPhone.
Download WhatsApp
[Re-Titled by Moderator]
iPhone 11 Pro Max, iOS 15
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If you can't make purchases or update apps, including free apps, you need to update your payment method or add a new one.
See also -> Payment methods you can use with your Apple ID
Payment methods you can use with your Apple ID – Apple Support (UK)
You can also use your Apple ID balance as payment method: Add money to your Apple ID balance
Add money to your Apple ID balance – Apple Support (UK)