I'm not sure what the carrier response to this question will be, but as a broker, I prefer telephone check calls. Having said that, our dispatch office has begun e-mailing carriers in the morning, requesting status reports on scheduled pick-ups and deliveries for the day. If we haven't received a response by mid to late morning, we follow up with a telephone call. For the most part, carriers are taking the time to respond via e-mail. Unless it is an emergency, or a dramatic change in the original instructions, we do try avoid pestering carriers, especially in the morning hours.