when i am trying to purchase via i tune it told me your purchase can not be completed please visit www.apple.com..... for more

Hello, Muho1986.

Thank you for visiting Apple Support Communities.

It sounds like you are unable to make a purchase on your iPhone. If you can't connect to the iTunes Store, here are some troubleshooting steps that may help with that.

If you can’t connect to the iTunes Store

If you are receiving an alert that you need to verify payment information, make sure that your billing information matches your bank records and take a look at the articles below.

Change or remove your Apple ID payment information

Pay an unpaid balance in the iTunes Store

If you are receiving an alert that you need to contact us for assistance with your iTunes account, please see the link below.

iTunes Support

Cheers