public ActionResult <string> Post([FromBody] Phone phone)
        {
            ActionResult retval = BadRequest(phone);

            try
            {
                if (phone != null)
                {
                    phone.PhoneId = Guid.NewGuid();

                    if (_phoneService.AddPhone(phone))
                    {
                        retval = new OkObjectResult(phone);
                    }
                }
            }
            catch (Exception e)
            {
                Console.Write(e);
            }

            return(retval);
        }