Not all eSIM connections are created equal. Japan and South Korea offer 5G access through premium carrier networks in nearly every corner of the country. Some island nations provide only a single 3G carrier option through a secondary wholesale agreement that no Tier 1 provider will touch.
Our coverage quality index puts a number on these differences, scoring all 215 destinations we track on a 1 to 100 scale. The score tells you what to expect from eSIM connectivity in each country before you commit to a plan. High scores mean fast speeds, multiple carrier options, and 5G in major cities.
Low scores mean limited data in rural areas and slower overall connections even in the capital.
dataDriven.methodology
Our coverage quality index uses four equally-weighted scoring dimensions, each contributing 25% of the final score. The first dimension is network count: the number of distinct carrier networks that eSIM providers in our review set partner with for a given destination. More carriers mean more redundancy and more competitive wholesale pricing that benefits consumers.
A destination with 6 carrier options scores higher than one with a single option. The second dimension is technology generation: the percentage of carrier network capacity in the destination that supports 4G LTE or 5G versus 3G and 2G only. Countries with near-universal 4G coverage and meaningful 5G rollout score highest.
The third dimension is measured speed: the median download speed from our monthly speed test dataset for that destination. A country with consistently fast measured speeds reflects strong real-world network quality. The fourth dimension is carrier tier: whether eSIM providers access Tier 1 networks (the national flagship carriers), Tier 2 networks (regional and secondary carriers), or Tier 3 networks (wholesale resellers with limited infrastructure).
Tier 1 access earns the highest score. All four dimensions are normalized to a 1 to 25 scale and summed for the final 1 to 100 score.
dataDriven.dataSummary
Coverage quality scores calculated for all 215 destinations using four equally-weighted dimensions: number of distinct carrier network partners (25%), percentage of 4G and 5G technology availability (25%), measured median download speed from our speed test dataset (25%), and carrier tier classification from premium Tier 1 to secondary Tier 3 networks (25%). Scores recalculated quarterly as new speed test data and carrier partnership data becomes available.
Top Countries by Coverage Quality Score
Japan leads the global rankings with a coverage quality score of 96 out of 100. NTT docomo and KDDI au operate nationwide 5G networks covering over 95% of the population, and eSIM providers who partner with these carriers deliver that same infrastructure to travelers. Measured download speeds in Japan average 128 Mbps across all providers in our test set.
South Korea scores 94, powered by SK Telecom and KT Corporation's dense urban networks and comprehensive rural coverage through their joint infrastructure sharing agreements. The Netherlands scores 91, the top European performer. KPN and T-Mobile Netherlands operate some of the most spectral-efficient networks in the world across a compact geography, delivering consistent high speeds throughout the country.
Germany scores 87. Telekom's nationwide 4G and expanding 5G coverage earns a high network quality score, though gaps in rural eastern states prevent a top-tier ranking. The United Kingdom scores 85, with EE and O2 providing solid nationwide coverage and 5G in all major cities.
The United States scores 83. T-Mobile's mid-band 5G rollout has been the fastest national deployment in history, but coverage gaps in rural western states and the Caribbean territories lower the composite score below Asian and Northern European leaders. Singapore scores 91, driven by Singtel's fiber-equivalent wireless speeds in the dense urban state.
Australia scores 82, with Telstra's premium network covering most of the populated eastern coast but coverage thinning rapidly in the vast interior.
Countries with Lower Coverage Quality Scores
Countries scoring below 40 on our index typically share one of three characteristics: they are remote island nations with a single carrier serving the local population under limited competition, they have telecommunications infrastructure challenges due to historical investment gaps, or they operate under regulatory environments that restrict the number of eSIM providers who can access local networks. Papua New Guinea scores 28. Digicel operates the main network, and eSIM providers access it through a third-tier reseller arrangement that limits speeds to 3G in most areas outside Port Moresby.
Solomon Islands scores 21, with a single Bmobile provider and speeds that rarely exceed 5 Mbps on eSIM connections. Yemen scores 19, where ongoing infrastructure damage from the civil conflict has reduced network reliability across the country. Chad scores 24, with Airtel and Moov operating 4G networks in the capital N'Djamena but 3G or no coverage in most of the country.
Equatorial Guinea scores 26, with limited eSIM provider access to the local carrier network. These scores are not a reason to avoid traveling to these destinations: many travelers visit them successfully with eSIM connectivity for essential navigation and messaging. But expectations should be calibrated.
A plan that delivers 80 Mbps in Tokyo will deliver 4 Mbps in the same low-scoring destination, not because the plan is different but because the local network infrastructure is different.
European Coverage Quality
Europe averages 81 out of 100 on our coverage quality index, making it the highest-scoring region globally. The combination of EU roaming regulation, high investment in 5G infrastructure, and strong carrier competition drives quality across the continent. The Netherlands (91), Germany (87), United Kingdom (85), Switzerland (84), Denmark (83), and Sweden (82) form the top European cluster.
France scores 79, slightly below the European average due to coverage gaps in rural southern and mountain regions. Spain scores 77, with strong urban coverage in Barcelona and Madrid but variable quality in rural areas. Italy scores 75, reflecting the Iliad disruption's positive effect on pricing and the coverage improvement programs that Telecom Italia and WindTre launched in response.
Eastern Europe scores lower on average but has shown the fastest improvement trend. Poland scores 68, Romania scores 64, and Bulgaria scores 58. All three have invested heavily in LTE infrastructure since 2022 and are approaching Western European quality levels in major cities.
The EU roaming context matters for eSIM travelers in Europe. Within EU and EEA countries, eSIM data is consumed from a single shared pool regardless of which country you are in, if the provider uses an EU-licensed operator as the carrier partner. HelloRoam and Airalo both offer Europe-wide plans on this basis.
Check your provider's terms to confirm whether your plan covers the EU destinations you plan to visit under a single data allowance.
Asia Coverage Quality
Asia averages 74 on our index, pulled upward significantly by the Japan (96) and South Korea (94) outliers. Removing these two countries drops the regional average to 64, which better represents the connectivity experience in the broader region. China presents a unique situation: carrier quality is extremely high on the domestic networks, but VPN usage restrictions and the specific eSIM regulatory environment mean that most international eSIM providers do not operate in China.
Travelers to China face a separate set of options that fall outside our standard comparison framework. Hong Kong scores 89, with PCCW and China Mobile Hong Kong providing full 5G coverage across the small territory. Taiwan scores 88, with Chunghwa Telecom and FarEasTone operating excellent networks.
Thailand scores 76, where AIS and TrueMove H have invested heavily in LTE and 5G infrastructure in Bangkok and tourist destination islands. Vietnam scores 64, with Viettel and VNPT operating strong city networks but variable rural coverage. Indonesia scores 61, with Java well-covered but outer islands significantly less so.
India scores 62. Airtel and Jio have deployed extensive 4G coverage, but the diversity of eSIM providers accessing these networks and the complexity of regional carrier agreements creates variability. The Middle East scores 71 on average.
The UAE scores 87, with Etisalat and du providing some of the fastest public mobile networks globally through their 5G city-wide deployments. Saudi Arabia scores 78, Qatar scores 82.
Which eSIM Provider Has the Most Coverage
Airalo covers the most countries of all 18 active providers at 200+ destinations, which is why it earns the Most Popular badge in our comparison. The breadth comes at a cost: in some markets, Airalo partners with secondary or tertiary carriers to achieve destination coverage, which means lower speeds than providers who focus on fewer markets but with premium carrier relationships. HelloRoam covers 185+ countries and focuses on Tier 1 carrier partnerships in its covered markets.
The result is a smaller coverage footprint than Airalo but higher measured speeds in the countries it does cover. Holafly covers 160+ countries, with its unlimited plan architecture requiring more intensive carrier negotiation per destination. Saily covers 150+ countries, with its European coverage being the deepest and most consistent of all providers we rate.
Nomad covers 130+ countries, with particularly strong coverage in Southeast and East Asia where its carrier partnerships are most competitive. The coverage count figures from each provider's own marketing should be viewed with some skepticism. Counting a destination as covered can mean anything from robust multi-carrier access to a single 3G roaming agreement.
Our coverage quality index attempts to quantify what that coverage actually delivers in practice. A provider covering 200 countries but scoring poorly on network tier and measured speed is not delivering the same value as one covering 150 countries with consistent Tier 1 access.
5G eSIM Coverage in 2026
5G eSIM access is available in 38 countries across our test portfolio as of June 2026. East Asia, Western Europe, and North America account for the majority of available 5G markets. South Korea and Japan provide 5G access through all major eSIM providers with carrier agreements in those markets.
The United States offers 5G through providers accessing T-Mobile and AT&T's networks. The UK, Germany, France, Italy, and Spain all have 5G available from at least one eSIM provider partner. Australia has Telstra 5G access available through select providers.
The UAE offers 5G through Etisalat and du partnerships with select providers. 5G eSIM availability within a country is not uniform. South Korea has near-universal 5G coverage in its cities. Germany has 5G in major urban centers but limited rural 5G.
Australia has 5G in the five major cities but not beyond. When evaluating 5G claims, check whether your provider's carrier partner in that country operates 5G in the specific cities you will visit. Our speed test data separates 5G from 4G LTE connections, showing an average 5G download speed of 214 Mbps versus 67 Mbps on 4G in the same markets.
For most travel use cases, 4G at 67 Mbps is completely adequate. The 5G advantage becomes relevant for travelers who plan to work from their phone as their primary device or who consume significant video content.
dataDriven.faq
Which country has the best eSIM coverage?
Japan scores highest on our coverage quality index at 96 out of 100, followed by South Korea at 94. Both countries benefit from multiple Tier 1 carriers, near-universal 5G rollout, and measured speeds exceeding 120 Mbps. The Netherlands scores 91, the highest in Europe. For travelers seeking the best possible eSIM connectivity experience, East Asia and Northern Europe offer the most consistent high-quality coverage.
Does eSIM work in rural areas?
It depends heavily on the destination country. In Japan, South Korea, Germany, and Australia, carrier networks extend to most rural areas and eSIM connectivity works reliably outside cities. In developing countries and island nations, rural coverage is often 3G or absent entirely. Before traveling to rural areas, check your provider's coverage map for the specific destination and verify which carrier network you will access. Our coverage quality index scores reflect the composite urban and rural performance, so destinations with high scores generally offer better rural coverage than those with low scores.
How many countries support 5G eSIM?
5G eSIM is available in 38 countries as of June 2026, based on our active test portfolio. The actual count of countries where 5G infrastructure exists is higher, but eSIM provider carrier agreements do not always include 5G tier access even where the local carrier operates 5G networks. Countries with the widest 5G eSIM provider support include South Korea, Japan, the United States, Germany, the United Kingdom, the Netherlands, Australia, and the UAE.
Which eSIM provider has the most coverage?
Airalo covers the most destinations at 200+ countries, earning its Most Popular badge in our comparison. HelloRoam covers 185+ countries with a focus on Tier 1 carrier partnerships in covered markets. Holafly covers 160+ countries. Coverage count alone does not determine quality: a provider covering 200 countries through secondary carrier agreements may deliver lower speeds than one covering 150 countries with premium network access. Our coverage quality index scores reflect actual delivered quality, not raw destination count.
Is eSIM coverage different from regular SIM coverage?
No. An eSIM connects to the same carrier network as a physical SIM card, using the same cell towers, frequency bands, and network infrastructure. The coverage you experience with an eSIM is determined entirely by which carrier network your eSIM provider has partnered with in that destination. If your provider accesses T-Mobile in the United States, your eSIM coverage matches T-Mobile's coverage map. The eSIM technology itself does not add or remove coverage.
Can I use eSIM in developing countries?
Yes, eSIM works in most developing countries where international carrier roaming is established. Over 180 of the 215 destinations we track have at least one eSIM provider offering coverage. Quality varies significantly. Countries like Kenya, Nigeria, and Colombia have growing LTE infrastructure and provide usable eSIM connectivity in major cities. Remote rural areas in these countries may have limited or no coverage. Always check your specific provider's coverage map for the destination and plan for offline maps in areas where connectivity is uncertain.
How is the coverage quality score calculated?
Our coverage quality score uses four equally-weighted dimensions, each contributing 25 points maximum. The first is network count: how many distinct carrier partners eSIM providers can access in that country. The second is technology generation: what percentage of available networks support 4G LTE or 5G. The third is measured speed: the median download speed we recorded in our monthly speed tests for that country. The fourth is carrier tier: whether providers access Tier 1 flagship carriers or secondary wholesale networks. Scores are recalculated quarterly as new data becomes available.
Does eSIM coverage include voice calls?
Most travel eSIM plans provide data only, not voice calls or SMS. Data-only eSIMs connect you to carrier networks for internet access, but incoming and outgoing calls on your home number continue to use your home SIM via dual SIM functionality. If you need voice calls while traveling, keep your home SIM active in the physical SIM slot for calls and use the eSIM for data. Some providers offer voice-enabled eSIMs for select destinations, but these are less common and typically more expensive than data-only plans.