I put my number but it doesn’t work, i am from Saudi Arabia

Have you contacted your carrier to do what is necessary to set up mobile billing?

If necessary, contact iTunes Support for assistance. See the Apple Support articles below for contact information.   

iTunes Support – world wide 

Apple Support schedule phone call     

Billings and Subscriptions 

If necessary, try Twitter

https://twitter.com/AppleSupport.  

Is your service with one of the companies below?

Saudi Arabia

• Mobily
• STC
• Zain