AIS Thailand

AIS Thailand's SIM2Fly ASEAN package gives you data, calls, and SMS across Vietnam and 31 other Southeast Asian countries without switching cards. As Thailand's largest mobile operator, AIS has deep regional infrastructure and partnerships, meaning coverage and speed in Vietnam are reliable. The plans start affordable and include apps to manage roaming while you travel.

This option works best if you're already in Thailand or planning a multi-country Southeast Asian trip. Compared to global eSIMs, it's stronger on voice and texts in the region, though data rates depend on your plan tier. If you prefer a single network across neighboring countries, AIS eliminates the need to juggle multiple providers.