def METHOD_NAME(self):
    CountryFactory(iso_3166_1_a2="DE", is_shipping_country=True)
    data = self.minimal_data.copy()
    data["phone_number"] = "07 914721389"  # local UK number
    data["country"] = Country.objects.get(iso_3166_1_a2="DE").pk
    self.assertFalse(ShippingAddressForm(data).is_valid())
    data["country"] = Country.objects.get(iso_3166_1_a2="GB").pk
    self.assertTrue(ShippingAddressForm(data).is_valid())