If there's an issue when you set up mobile phone billing
If your network operator supports it, you can pay for your App Store and iTunes Store purchases and more through mobile phone billing. If you have an issue when you set up mobile phone billing, find out what to do.
Mobile billing is currently available only in some countries and regions.
Find out which payment methods you can use in your country or region
Find out how to add a payment method
If you can't find Use This Mobile Number, or want to use a different number
If you're on a different phone, or using an iPad or iPod touch, you might want to use a different number when you set up mobile phone billing.
When you change your payment method, tap "Use a Different Mobile Number" and enter the mobile number for the phone connected to the account that you want to bill to.
An SMS message with a one-time code is sent to the mobile number that you provided. Check the mobile phone for the message, and enter the code on the device that you're using to set up your payment method, then tap Verify to verify the code. If you don’t receive the code immediately, tap "Resend Code" to try again.
If you still don't see an option to use a mobile number, your carrier might not support mobile phone billing.
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