Not able to make purchases from my iPhone

If you already tried (to no avail) all the steps provided in this support article:--> If you need to change or update your Apple ID payment method , I suggest that you contact iTunes Store Support Team directly, and explain your problem, using this specific link:--> https://getsupport.apple.com/?caller=ikb&PGF=PGF51002&category_id=SC0060&symptom_id=21084

(if you get no help, look at the bottom of the above link, where you can contact them using "chat" or "phone" options).

Regards

Giulio

If it said why you cannot do this, telling us what it said would help us IMMENSELY in helping you.