1. Click 'See More' to expand and explore additional options.
2. Then, go to 'Update My Profile' to manage your settings.
3. Now, select 'Phone Numbers' to proceed with number selection.
4. Click 'Add Phone Number' to start adding a new number.
5. Choose your preferred country for the new phone number.
6. Pick your desired number from the provided list.
7. Finally, confirm your selection and proceed with the purchase.