SMS gateways are critical for SMS sending services. These gateways must remain up as much as possible to ensure no interruptions to the service. When interruptions do occur, giving customers a way to check is valuable so they know you're aware and working to restore the system. Set up a keyword for users to subscribe to notifications on whether the system is up or down. Now they'll automatically receive messages if the system status changes. You can also set up keywords that users can text and receive system status updates. If you're planning on having any outages, sending out an SMS blast can keep users updated.