Why cant I download apps on my iPhone because of billing?

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4. Are 3rd party apps safe?
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6. Why is my download failing?
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Tags

1. #iphone
2. #section
3. #usual
4. #settings
5. #payment
6. #account
7. #itunes
8. #store
9. #information
10. #choose
11. #button
12. #apple
13. #email