I have already made my Apple ID through Game center instead of doing it first on the App store. Now I want to download another app so I have to log in my apple ID to app store then when I have logged in something popped saying "This apple ID has not yet been used in the itunes store" then theres options Cancel or Review when i click the review one theres this terms and conditions then agree or back only. i chose agree then the credit card billing appear how can i login without entering credit card informations? And can i use the apple id i made at the game center? i think its just the same, isnt? Thanks!!
If you already have an Account (or Apple-ID, iTunes-Account, GameCenter-ID etc.) you have to login into iTunes using your credentials from a Computer (Mac or PC), there you have the Option to select "none" in the Billings-Settings.
I figure you need to create a new Apple ID. I just remembered that the None option is hidden when you update a Game Center ID. Alternatively, (not reccommended) you could enter phony info.
According to Apple as of (Last Modified: Jul 14, 2014) you do not need credit card for Apple Store.
Apple also recommends to have only one ID, for game center and all others.
You will be asked for payment information if you use products that are not free.
Create an iTunes Store, App Store, or iBooks Store account without a credit card or other payment method.
There are 2 possibilities:
One is you already have a Apple Id, and you want to remove the Payment information.
Second one is you are creating a new account (without Payment information.)