Help needed for my iphone

[Best of the best]

Hi just to check y am I not able to download app to my iPhone.My version is 7.
Should at least able to download ways app or wechat but can't.
It also ask for my card details n address too when I want to download them.
Pls help

 

[PetPet]

Enter your credit card details.
Don't worry, as long the app is free you'll not be charged.

 

[Best of the best]

After I key my details of my Apple ID it say
"This Apple ID has not yet been used in the iTunes Store"
Why it say that

 

[tec_geek]

After I key my details of my Apple ID it say
"This Apple ID has not yet been used in the iTunes Store"
Why it say that

Might be that you haven't activated your Apple ID. Check in your email if you have received any emails from Apple (like Apple ID, iTunes or the App Store).