code: func (s *SMSServiceProxySeparateRussia) Send(phonenumber string, message string) (err error) {
  	if IsRussianMobileNumber(phonenumber) {
  		return s.RussianSMSService.Send(phonenumber, message)
  	}
  	return s.DefaultSMSService.Send(phonenumber, message)
  }
docs: // Send proxies the send call to the right provider based on the phonenumber