"We're always working to improve our tracking. Now with up to 11 scans per shipment, it's easier than ever to see where your package is at pickup, confirmed final delivery, and many points in between. And with new text alerts, you'll get updates on your package sent right to your phone. You can opt-in on our tracking web site or by simply texting your tracking number to 2USPS (28777). Choose between receiving alerts for all activity or just for delivery attempts."
Re-post from the website at www.USPS.com