The latest updates to the mobile SDKs of Courier focus on improving usability, reliability, and developer experience. The Courier.shared functions have been upgraded to be actors, enhancing concurrency safety and reducing potential race conditions. New features are being developed for the Flutter SDK, with improvements expected to launch in the coming weeks. Carter Rabasa has joined Courier as their Head of Developer Relations, bringing his expertise from leading DevRel and Product teams at Twilio. The company also offers free tools and resources, including a notification service that can send up to 10,000 messages per month for free.