Can this specific EastESIM plan be used in other Southeast Asian countries, such as Thailand or Cambodia?

This particular EastESIM plan is specifically for use within Vietnam only. For travelers embarking on a multi-country journey through Southeast Asia, perhaps exploring the vibrant markets of Bangkok, the ancient temples of Siem Reap in Cambodia, or the serene landscapes of Laos, a single-country plan won't suffice. We highly recommend our EastESIM Asia Regional Plan. This comprehensive option provides continuous data coverage across multiple nations, offering unparalleled convenience and ensuring you stay connected throughout your entire Southeast Asian adventure without needing to switch plans.