New Horizon Experience. This article describes the New Horizon Experience, which is available now. As of September 28, 2026, New Horizon is the default starting point on a computer or laptop. Mobile apps already use New Horizon. If you still have the older layout, choose Switch to New Horizon from the banner or your account menu.
Assignment texts respect quiet hours you set on your own profile. Open Personal Profile, then open Notifications. On the Assignment text messages card, set Do not text before and Do not text after so messages wait until your preferred window. Save the Notifications section when you finish.
On the older legacy layout, the same quiet-hour controls appear on the Text Messaging tab of Personal Profile.
Why free Email-to-SMS texts can arrive late
Free assignment texts use Email-to-SMS carrier gateways. Carriers can delay, filter, throttle, or reject those messages. Horizon may retry for a period, but delivery timing is not guaranteed on that path.
More reliable options for Officials
For dependable delivery, Officials can use paid Premium SMS (real text messages) from Add-on services on Personal Profile, or install the Horizon WebRef mobile app for free push notifications on Android and iOS. Quiet hours still apply when Premium SMS is active. See the Personal Profile article for Notifications and Add-on services details.