I can't download Apps on my iPhone

Why not? Does it provide a reason that you can share with us?

If a message says 'Your account has been disabled in the App Store and iTunes' - Apple Support you must contact Apple for help. This is not something you can fix yourself. Apple provides a contact link for this specific issue. Tap or click here --> https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

If it is another reason, post with more details.

Says it can't download apps from App Store or iTunes

I can’t get apps downloaded it sends me to payment method and won’t allow me to download anything