Asia eSIM

Planning a trip across Asia? Whether you're landing in Tokyo, island-hopping in Southeast Asia, or heading to a business hub like Singapore or Hong Kong, staying connected is easier than ever with an eSIM from Simcardo. Asia spans dozens of distinct mobile markets — from world-leading 5G networks to emerging 4G infrastructure — and a travel eSIM means you can activate data before your flight even lands.

Japan is one of the world's most connected destinations. The three major operators — NTT Docomo, KDDI (au), and SoftBank — collectively cover over 98% of the population with 4G/LTE, and 5G is widely available in major cities including Tokyo, Osaka, Kyoto, and Sapporo. Our partner networks in Japan connect to this infrastructure, delivering fast and reliable speeds whether you're navigating Shibuya or hiking in Nikko. South Korea similarly leads globally, with SK Telecom, KT (Olleh), and LG U+ running expansive 5G networks across Seoul, Busan, and beyond.

In Southeast Asia, 4G LTE is the dominant standard and covers the vast majority of tourist destinations. Thailand's network is serviced by carriers including AIS, TrueMove H, and DTAC, giving excellent coverage from Bangkok and Chiang Mai to the islands. Vietnam is covered by Viettel, Mobifone, and Vinaphone (VNPT) — 2G was phased out nationally in 2024, accelerating 4G deployment even in rural areas. Indonesia relies heavily on Telkomsel, the country's largest operator, for solid 4G coverage across Bali, Jakarta, and major island groups. Singapore is a standout with 95% 5G standalone population coverage.

Traveling to India? Our partner networks leverage Jio and Airtel infrastructure, which together offer 4G coverage across 95%+ of major tourist and urban areas, with 5G expanding rapidly in Delhi, Mumbai, and Bangalore. Taiwan's networks, led by Chunghwa Telecom, achieve near-universal 4G coverage with a score of 9.3/10 in independent coverage audits. Hong Kong benefits from dense urban infrastructure through carriers such as HKT (CSL).

China requires specific planning. Travel eSIMs that roam via international partner networks typically route data through servers outside mainland China, which in practice means many users can access international services that are restricted on local Chinese networks — however, this is not guaranteed for all services or all providers, and regulations can change. Purchase your eSIM plan before arriving in China, as adding data once in-country can be difficult due to local app store and payment restrictions.

With Simcardo, a single eSIM profile can cover multiple Asian destinations on one trip — ideal for the growing number of travelers combining Japan and South Korea, or backpacking from Thailand through Vietnam into Cambodia. No physical SIM swap needed, no airport queues: just activate and go.