I am unable to download apps

Start here:

If you can’t download or update apps on your iPhone or iPad – Apple Support

If you are experiencing difficulties with adding or removing Apps to/from your iPad, you need to check your ScreenTime restrictions:

• Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > Adding Apps - ensure that this permission is set to Allow
• Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > Deleting Apps - ensure that this permission is set to Allow

What happens when you try?

If there is an error message, what is the exact

complete text of that error message?

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Writing an effective Apple Support Communities question:

https://discussions.apple.com/docs/DOC-5931

Did you setup a payment method for all of the Apple online stores in the Settings app, tap your large Apple ID panel at the top, tap the Payments & Shipping panel, then add a method of payment to be able to use all of Apple's online stores?