Why won't my phone allow me to change my Country/Zone?

If you're a part of a Family Sharing group, you might not be able to change your country or region. Learn how to leave a Family Sharing group.

What to do before you change your country or region

• Spend any store credit remaining on your Apple ID. Learn what to do if your remaining store credit is less than the cost of a single item.
• Cancel any subscriptions, including Apple Music, and wait until the end of the subscription period. 
• Wait for any memberships, pre-orders, movie rentals, or Season Passes to complete, and wait for any pending store credit refunds to process.
• Make sure that you have a payment method for your new country or region.
• Redownload your apps, music, movies, TV shows, and books on any devices that you might use to play or read them in the future. That's because some types of content might not be available in your new country or region. (Learn what types of content and services are available in your new country or region.)

Based on your country of residence or country you have selected under your Apple ID --> Payment methods that you can use with your Apple ID - Apple ...

Ask your bank only one thing, i.e. if the Debit/Credit card which is issued to you is valid internationally.

Rest everything check at your end.

Check the following

1. The payment method that you are adding is of the same country as that of App Store Country on your iPhone
2. You have valid payment plan / debit / credit card from an authorised bank from the same country as that of your Apple ID
3. Learn more about family purchases and payments.

If you can't choose None when you edit your Apple ID payment information

1. If you have an unpaid balance or payment due
2. If you have a subscription that automatically renews
3. If you're using the iTunes Store or App Store for the first time
4. If you are not in the country or region you’re creating an Apple ID for
5. If you changed your country or region
6. If you're a part of Family Sharing