Getting your data sorted before you leave is far easier than hunting for a local SIM at the airport. HelloRoam sends a QR code to your email right after purchase. Japan, South Korea, and Taiwan consistently rank at the top of global mobile network benchmarks. A HelloRoam East Asia regional eSIM connects you to these premium networks for the popular Tokyo-Seoul-Taipei travel circuit.
Japan has near-universal network coverage including on the Shinkansen bullet train network, subway systems in Tokyo, Osaka, Kyoto, and Sapporo, and even in rural mountain areas. NTT Docomo and SoftBank operate 5G in all major cities. Japan's indoor coverage is exceptional, including in shopping malls, department stores, and underground arcades.
South Korea has one of the world's highest 5G penetration rates. SK Telecom and KT operate dense 5G networks in Seoul, Busan, Incheon, and across the country. Coverage on the Seoul Metro is excellent throughout all lines. Jeju Island and coastal areas have strong 4G. Even remote mountain areas in Gangwon Province have reasonable coverage along main roads.
Taiwan has excellent 4G and growing 5G from Chunghwa Telecom and FarEasTone. Taipei's MRT system has full underground coverage. The east coast (Taroko Gorge, Hualien), Sun Moon Lake, and Kenting are all well-served. Mountain roads through the Central Mountain Range can have brief gaps.
Hong Kong has some of the world's densest mobile coverage. All MTR lines, major buildings, and outdoor areas have excellent 4G and 5G. PCCW, SmarTone, and CSL operate competitive networks across this compact territory.
Mongolia covers a vast country with coverage primarily in Ulaanbaatar and along main highways. The steppe and Gobi Desert grasslands away from settlements have no mobile coverage. Adventure travellers to the Gobi Desert and remote steppe areas should plan entirely for offline operation.
Apple App Store
