eSIM East Asia from £0.77

Name: eSIM East Asia
Brand: HelloRoam

HelloRoam is a global eSIM provider offering instant mobile data in 185+ countries. Buy prepaid travel eSIM plans with no extra fees, no contracts, and instant activation on any eSIM-compatible device.

An eSIM for East Asia from HelloRoam starts at £0.77 per day across 204+ carrier networks in 185+ countries. Activate via QR code in under two minutes on any eSIM compatible phone. Keep your EE, Vodafone, or Three number active through dual SIM.

194+
Mobile networks
5G and 4G LTE
5G support
under two minutes
Setup

Last updatedMay 2026

Your East Asia eSIM with local network coverage

Cheap eSIM for East Asia, starting from £0.77. Local 4G LTE and 5G data on top carrier networks in East Asia. Works on all eSIM compatible phones. Japan, South Korea, Taiwan, and China form a natural long-haul loop for British travellers and all four have outstanding mobile infrastructure. An eSIM for East Asia from HelloRoam starts at £0.77 on carriers across 3 countries networks across Tokyo, Seoul, Taipei, and Beijing. Activate by QR before your outbound flight from Heathrow or Manchester and arrive at Narita, Incheon, or Taoyuan already connected. A 180-day money-back guarantee applies to every plan. Choosing an eSIM East Asia from HelloRoam means instant QR delivery, no contract, and local network speeds from the moment you land.

East Asia eSIM with fast 5G and 4G LTE coverage

HelloRoam East Asia eSIM covers Japan, South Korea, Taiwan, Hong Kong, Macau, and Mongolia on one plan. British travellers doing the classic Tokyo-Seoul-Taipei circuit stay connected with instant data at every destination. Plans start at £0.77 per day.

Plans start at $1.03 with 5G and 4G LTE speeds
Coverage from local networks
Instant activation in under 2 minutes
180-day money-back guarantee
East Asia coverage across major cities

Network: 5G and 4G LTE
Plans From: $1.03
Activation: Under 2 min
Guarantee: 180 days

Holiday changed? Not to worry, your money is safe.

Plans change. With HelloRoam, you can request a full refund on any unused eSIM plan within 180 days of purchase. No questions asked if the eSIM has not been activated.

Learn more about our refund policy

HelloRoam East Asia eSIM vs EE, Vodafone and Three roaming

When comparing eSIM vs a travel SIM card for East Asia, HelloRoam wins on price. EE charges £6/day on their Roam Abroad Pass, Vodafone charges £6.85/day on Xtra roaming, and Three Go Roam applies fair-use data caps. Skip the airport SIM kiosk and get the cheapest eSIM deal from £0.77 with instant QR activation.

HelloRoam East Asia eSIM vs EE, Vodafone and Three roaming
Feature		UK carrier roaming add-on	Budget eSIM
180-day refund policy
Round-the-clock live chat
£0 activation fees
99.8% uptime guarantee
No data overage charges
Instant QR code delivery
Premium East Asia carrier networks

Why UK Travellers Pick HelloRoam e-sim for East Asia

HelloRoam vs Other eSIM Providers for East Asia

HelloRoam eSIM reviews from UK travellers highlight the 180-day refund policy, no activation fees, and round-the-clock live support. See how HelloRoam compares to Airalo, Holafly, Saily, and other eSIM providers for your East Asia holiday.

Feature comparison
Feature comparison		Airalo	Holafly	Nomad	Saily	Ubigi
180-day refund policy
24/7 live chat support
£0 activation fees
99.8% uptime guarantee
No data overage charges
Instant QR code delivery
Premium East Asia carrier networks
Own branded carrier identity (SPN)

East Asia — mobile connectivity coverage

eSIM coverage guide for East Asia travel from the UK

East Asia hosts three of the world's top five fastest mobile networks. Japan, South Korea, and Taiwan consistently rank at the top of global mobile network benchmarks.

A HelloRoam East Asia regional eSIM connects British travellers to these premium networks for the popular Tokyo-Seoul-Taipei 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, SoftBank, and au operate 5G in all major cities.

Japan's indoor coverage is exceptional, including in shopping malls, department stores, and underground shopping arcades.

South Korea has one of the world's highest 5G penetration rates. SK Telecom, KT, and LG Uplus operate dense 5G networks in Seoul, Busan, Incheon, and across the country. Coverage on the Seoul Metro is excellent throughout all lines.

Even remote mountain areas in Gangwon Province have reasonable coverage along main roads.

Taiwan connects to Chunghwa Telecom, Taiwan Mobile, and Far EasTone. Taipei's MRT system has full underground coverage. The east coast (Taroko Gorge, Hualien), Sun Moon Lake, and Kenting are all well-served.

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, HKT, 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 away from settlements have no mobile coverage.

Japan, South Korea, and Taiwan rank among the world's top five fastest mobile networks
Excellent subway and underground transit coverage in Tokyo, Seoul, and Taipei
Japan's Shinkansen has in-train 4G and 5G coverage throughout
Hong Kong has near-total coverage across the entire city
Mongolia outside Ulaanbaatar has very limited coverage
Mainland China requires a separate plan due to network restrictions

SourcesOokla Global Speedtest Index 2025; GSMA 2026; HelloRoam Partner Network Data 2025

eSIM Travel Tips for East Asia

Japan's Shinkansen has in-train coverage
Japan's Shinkansen bullet train network has 4G and 5G coverage throughout most routes including tunnels on the Tokaido, Sanyo, and Tohoku lines. You can stream, navigate, and message throughout train journeys from Tokyo to Osaka, Kyoto, Hiroshima, and Sapporo. Brief gaps may occur in the longest tunnel sections.
South Korea's rail and metro are well-covered
KTX high-speed rail in South Korea has good 4G coverage along routes from Seoul to Busan, Gyeongju, and Gangneung. The Seoul Metro has coverage throughout all underground sections. Download your Seoul neighbourhood maps even though coverage is reliable, as offline maps load faster.
Taipei's night markets have heavy network demand
Taipei's famous night markets (Shilin, Raohe, Ningxia) draw large crowds in the evenings, which can slow 4G speeds due to network congestion. Download any content you need for the evening before heading into the market. Navigation apps still work but may load slowly during peak hours.
Hong Kong's MTR has perfect underground coverage
Hong Kong's MTR subway system has full 4G and 5G coverage on all lines including deep underground sections. HKT, PCCW, and CSL have installed repeaters throughout the system. You can navigate, message, and stream throughout any MTR journey on your HelloRoam eSIM.
Mongolia requires full offline preparation
Outside Ulaanbaatar and provincial capitals, Mongolia has no mobile coverage across the vast steppe, Gobi Desert, and mountain wilderness areas. For any steppe tour, ger camp stay, or Gobi Desert trip, download all maps, guides, and emergency contacts before leaving Ulaanbaatar. GPS hardware in your phone works without data but only shows your location on downloaded maps.
Check if mainland China is on your plan
Mainland China has separate and restricted network access due to the Great Firewall. Most East Asia regional plans do not include China or have very limited access. Hong Kong is separate from mainland China and is covered normally. If your trip includes mainland China, verify coverage or plan for a separate option.
Emergency numbers in East Asia
East Asia emergency numbers: Japan uses 110 for police and 119 for fire and ambulance. South Korea uses 119 for fire and medical and 112 for police. Taiwan uses 110 for police and 119 for fire and ambulance. Hong Kong uses 999 for all emergencies. Mongolia uses 102 for police and 103 for ambulance. Save the correct numbers for each country.

Network coverage across East Asia: what British travellers need to know

East Asia's mobile networks are consistently among the world's top performers in speed, coverage, and innovation.

Japan's NTT Docomo leads in coverage breadth. Docomo's network reaches remote mountain villages, small rural towns, and most offshore islands. SoftBank and au (KDDI) compete in urban markets with strong 5G. Japan has exceptionally deep indoor coverage, including in multi-level underground shopping complexes.

South Korea pioneered 4G LTE deployment and has the world's highest 5G penetration rates. SK Telecom, KT, and LG U+ all operate nationwide 5G. Average 5G download speeds in Seoul rank among the world's fastest. Even relatively rural areas in Jeolla and Gangwon provinces have strong 4G.

Taiwan's Chunghwa Telecom (CHT) and Taiwan Mobile lead in national coverage. Taipei's dense urban network competes with Tokyo and Seoul for speed. The east coast scenic rail line through Taroko Gorge has good coverage.

Hong Kong's three operators (PCCW, HKT, CSL) serve one of the world's densest urban environments. Coverage in high-rise residential buildings, the harbour waterfront, and the airport all meet premium standards.

Mongolia presents the stark opposite: Mobicom and Unitel cover Ulaanbaatar and provincial towns, but Mongolia's vast geography simply cannot support universal coverage.

NTT Docomo (Japan): Network carrier
S SK Telecom (South Korea): Network carrier
K KT (South Korea): Network carrier
C Chunghwa Telecom (Taiwan): Network carrier
P PCCW (Hong Kong): Network carrier
M Mongolia Telecom: Network carrier

Best times for East Asia travel data

Japan's peak travel seasons are cherry blossom (late March to early April) and autumn foliage (mid-October to November). Tokyo, Kyoto, and Osaka networks see heavy demand in popular viewpoint areas during these brief seasons. Download Kyoto's temple routes offline before peak blossom weekends.

South Korea's Seoul and Jeju Island see peak domestic travel during national holidays. Network congestion at popular destinations like Bukchon Hanok Village and Myeongdong can slow speeds.

Taiwan's travel peaks during Lunar New Year (late January to February). Taipei's night market district and Sun Moon Lake have their busiest days during national holidays.

Check Device Compatibility Data Usage Calculator

Prices verified: 31 May 2026

Common Questions About East Asia eSIM

An eSIM in East Asia from HelloRoam starts at £0.77 with multi-country coverage across Japan, South Korea, Taiwan, and China. Buy once, scan the QR code at home, and use one plan across every destination without swapping providers. A 180-day refund guarantee applies to every plan.

eSIMs East Asia plans from HelloRoam cover Tokyo, Osaka, Kyoto, Seoul, Busan, and Taipei on carriers across 3 countries 4G/5G networks from £0.77 with one QR activation before your UK departure. No contracts and no border swaps. A 180-day refund guarantee applies to every plan.

A HelloRoam eSIM in East Asia covers main destinations across the region including Japan, South Korea, and Taiwan on carriers across 3 countries 4G/5G networks from £0.77 on qualifying plans. Check the HelloRoam plan selector to confirm exact country coverage for your chosen plan before purchasing.

Buying local SIMs at Tokyo Narita, Seoul Incheon, and Taipei Taoyuan separately involves registration queues at each airport after a long-haul flight. A HelloRoam eSIMs East Asia plan covers multiple stops from £0.77 with one QR code installed at home before your Heathrow departure. Skip every registration counter on your East Asia trip.

Japan is covered by HelloRoam East Asia plans with full access to NTT Docomo, SoftBank, and au 5G networks. Coverage is near-universal including on the Shinkansen bullet train, Tokyo's subway, and rural mountain areas. Japan consistently ranks among the world's top mobile networks for speed and reliability.

South Korea is covered by HelloRoam East Asia plans. SK Telecom, KT, and LG Uplus operate nationwide coverage. Seoul, Busan, Incheon, and Jeju Island all have strong coverage. South Korea has one of the world's highest 5G adoption rates. Seoul Metro provides coverage throughout all underground sections.

Taiwan is covered by HelloRoam East Asia plans. Taipei, Kaohsiung, Taichung, and Hualien connect to Chunghwa Telecom, Taiwan Mobile, and Far EasTone networks. Taipei MRT has full underground coverage. Taroko Gorge and Sun Moon Lake are well-served. Mountain highway passes can have brief gaps.

Hong Kong is covered by HelloRoam East Asia plans with some of the world's densest network coverage. All MTR lines, major landmarks, and outdoor areas have excellent 5G and 4G. PCCW, HKT, and CSL operate highly competitive networks throughout this compact city.

Mongolia is partially covered by HelloRoam East Asia plans. Ulaanbaatar and main provincial capitals have 4G from Mobicom and Unitel. The vast steppe, Gobi Desert, and mountain wilderness areas have no coverage. Download offline maps, ger camp GPS coordinates, and emergency contacts before leaving the capital for any rural adventure.

Mainland China has separate network access rules and the Great Firewall restricts many apps. Most East Asia regional plans do not include mainland China or have very limited access. Hong Kong and Macau are typically covered separately and are not subject to mainland China's network restrictions.

Number of days	Price
1 day	£5.52
3 days	£15.87
7 days	£37.05
15 days	£76.79
22 days	£107.57
30 days	£141.50

Category	Recommended	Individual country SIM cards	UK carrier international roaming (EE, Three, Vodafone UK, O2)
Typical cost	—	—	—
Details	One plan for Japan, South Korea, Taiwan, Hong Kong, and Macau. Buy once before departure from the UK. No hunting for SIMs in Tokyo's crowded arrival halls. Consistent pricing for your entire East Asia circuit.	Japan's convenience store and airport SIMs are well-organised but require in-country purchase. South Korea requires passport for SIM registration. Buying and managing three separate SIMs for a multi-country trip is cumbersome.	UK carriers charge daily fees for Japan and South Korea. A 14-day Tokyo-Seoul-Taipei trip costs significant daily charges. Most plans throttle speeds after a small data cap.

Number of days	Price
1 day	£5.52
3 days	£15.87
7 days	£37.05
15 days	£76.79
22 days	£107.57
30 days	£141.50

Category	Recommended	Individual country SIM cards	UK carrier international roaming (EE, Three, Vodafone UK, O2)
Typical cost	—	—	—
Details	One plan for Japan, South Korea, Taiwan, Hong Kong, and Macau. Buy once before departure from the UK. No hunting for SIMs in Tokyo's crowded arrival halls. Consistent pricing for your entire East Asia circuit.	Japan's convenience store and airport SIMs are well-organised but require in-country purchase. South Korea requires passport for SIM registration. Buying and managing three separate SIMs for a multi-country trip is cumbersome.	UK carriers charge daily fees for Japan and South Korea. A 14-day Tokyo-Seoul-Taipei trip costs significant daily charges. Most plans throttle speeds after a small data cap.

eSIM East Asia

Your East Asia eSIM with local network coverage

eSIM East Asia

Your East Asia eSIM with local network coverage

East Asia eSIM with fast 5G and 4G LTE coverage

Holiday changed? Not to worry, your money is safe.

HelloRoam East Asia eSIM vs EE, Vodafone and Three roaming

Why UK Travellers Pick HelloRoam e-sim for East Asia

HelloRoam vs Other eSIM Providers for East Asia

eSIM coverage guide for East Asia travel from the UK

eSIM Travel Tips for East Asia

Network coverage across East Asia: what British travellers need to know

Best times for East Asia travel data

Common Questions About East Asia eSIM

How much does an eSIM in East Asia cost for British visitors going to Japan and South Korea?

Which eSIMs East Asia plan covers Japan, South Korea, and Taiwan together?

Does an East Asia eSIM cover Japan, South Korea, and Taiwan on one plan?

Is an East Asia eSIM cheaper than buying separate SIMs at Narita, Incheon, and Taoyuan?

Does an East Asia eSIM work in Japan?

Does an East Asia eSIM work in South Korea?

Does an East Asia eSIM work in Taiwan?

Does an East Asia eSIM work in Hong Kong?

Does an East Asia eSIM work in Mongolia?

Does an East Asia eSIM include mainland China?

East Asia eSIM with fast 5G and 4G LTE coverage

How to Set Up an eSIM in East Asia

Holiday changed? Not to worry, your money is safe.

HelloRoam East Asia eSIM vs EE, Vodafone and Three roaming

Why UK Travellers Pick HelloRoam e-sim for East Asia

Round-the-clock live chat support

Best eSIM for East Asia

Dual SIM ready

204+ carrier networks including East Asia

Data alerts before you run out

Local network speeds in East Asia

Global and regional plans

Hotspot and data sharing in East Asia

eSIM Prices for East Asia

HelloRoam vs Other eSIM Providers for East Asia

What Is an e SIM? How eSIM Works in East Asia

eSIM coverage guide for East Asia travel from the UK

eSIM Travel Tips for East Asia

Network coverage across East Asia: what British travellers need to know

HelloRoam East Asia eSIM vs UK carrier charges for British travellers

Best times for East Asia travel data

Explore Countries in East Asia

Japan

China

South Korea

Common Questions About East Asia eSIM

How much does an eSIM in East Asia cost for British visitors going to Japan and South Korea?

Which eSIMs East Asia plan covers Japan, South Korea, and Taiwan together?

Does an East Asia eSIM cover Japan, South Korea, and Taiwan on one plan?

Is an East Asia eSIM cheaper than buying separate SIMs at Narita, Incheon, and Taoyuan?

Does an East Asia eSIM work in Japan?

Does an East Asia eSIM work in South Korea?

Does an East Asia eSIM work in Taiwan?

Does an East Asia eSIM work in Hong Kong?

Does an East Asia eSIM work in Mongolia?

Does an East Asia eSIM include mainland China?

How to Set Up an eSIM in East Asia

Round-the-clock live chat support

Best eSIM for East Asia

Dual SIM ready

204+ carrier networks including East Asia

Data alerts before you run out

Local network speeds in East Asia

Global and regional plans

Hotspot and data sharing in East Asia

eSIM Prices for East Asia

What Is an e SIM? How eSIM Works in East Asia

HelloRoam East Asia eSIM vs UK carrier charges for British travellers

Explore Countries in East Asia

Japan

China

South Korea