Southeast Asia is one of the world's most popular multi-country travel corridors, and staying connected across 11 countries used to mean buying a new SIM at every border.
A HelloRoam Southeast Asia regional eSIM replaces that with one plan that switches carriers automatically as you move from Thailand to Cambodia to Vietnam to Laos.
Singapore leads the region with near-perfect 4G and 5G coverage from Singtel, StarHub, and M1. It is the region's most reliable data hub and works as a perfect test point before continuing to countries with weaker infrastructure.
Thailand is the region's top-performing network outside Singapore, led by AIS, DTAC, and True Move. Bangkok, Chiang Mai, Phuket, and Pattaya all have strong coverage. Popular islands like Koh Samui, Koh Phangan, and Koh Lanta have 4G in resort areas.
Remote northern highlands near Myanmar and Laos borders have gaps.
Vietnam connects through Viettel, Mobifone, and Vietnamobile. Ho Chi Minh City and Hanoi have dense coverage. Hoi An, Da Nang, and Hue are well-served. The northern mountain provinces (Sapa, Ha Giang) have more limited signal in rural areas.
Indonesia presents the biggest coverage challenge in the region. Bali, Java (Jakarta, Yogyakarta, Surabaya), and Sumatra connect to Telkomsel, Indosat, and XL Axiata 4G. Indonesia's 17,000+ islands mean outer provinces like Papua, Maluku, and remote Sulawesi have very poor coverage.
Globe Telecom and Smart Communications are expanding 4G in the Philippines. Manila, Cebu, and Davao are well-served. Tourist islands vary from good coverage at Boracay to very limited signal on remote Palawan beaches.
Cambodia, Laos, and Myanmar have the region's most limited networks. Main cities and tourist hubs (Phnom Penh, Siem Reap, Vientiane, Luang Prabang, Yangon) have functional 4G. Rural areas often have no signal.
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