Will my SouthESIM work on the Laos-China Railway high-speed train?

On the Laos-China Railway, your SouthESIM will generally provide 4G signal at stations like Vang Vieng and Boten, perfect for last-minute checks or sharing arrival updates. However, as the train zips through the many scenic tunnels between Vientiane and Luang Prabang, you might experience occasional signal drops. It's a great opportunity to enjoy the views or catch up on some reading before reconnecting at the next stop!