# File lib/sms_on_rails/service_providers/email_gateway_support/errors.rb, line 7
      def self.phone_message(phone_number)
        msg =  "Invalid phone number #{phone_number.human_display if phone_number}. "
        msg << "Please specify the digits and the option :carrier, "
        msg << "or specify the full email address like 2065551234@txt.att.net"
      end