old_contents: # -*- coding: utf-8 -*-
  # Part of Odoo. See LICENSE file for full copyright and licensing details.
  
  from odoo import models
  
  
  class CrmLead(models.AbstractModel):
      _inherit = 'crm.lead'
  
      def _sms_get_number_fields(self):
          """ This method returns the fields to use to find the number to use to
          send an SMS on a record. """
          return ['mobile', 'phone']
  
new_contents: # -*- coding: utf-8 -*-
  # Part of Odoo. See LICENSE file for full copyright and licensing details.
  
  from odoo import models
  
  
  class CrmLead(models.Model):
      _inherit = 'crm.lead'
  
      def _sms_get_number_fields(self):
          """ This method returns the fields to use to find the number to use to
          send an SMS on a record. """
          return ['mobile', 'phone']
  
subject: fix class inheritance