Why won't my iPhone let me download free apps?

Welcome to Apple Support Communities.

See: If you can’t download or update apps on your iPhone or iPad - Apple Support.

Jack

taihairs Said:

"HELP: my phone won’t let me download free apps?"

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In-App Purchases:

You need at least one method of payment assigned to your device. This is because even though an app may be free, in-app purchases are an option.