10 Best Overseas SIM Services Thoroughly Verified | Optimal Solutions Selected by Communication Speed, Price, and Convenience

Essential communication environment for overseas travel and business trips. Overseas SIM and eSIM services that are more affordable than traditional carrier roaming and can ensure communication speed are gaining attention. However, with many options available in the market, it can be difficult to decide which service to choose.

In this article, we thoroughly evaluate the top 10 overseas SIM services based on “communication speed,” “affordability,” and “less likelihood of speed restrictions.” We introduce the best overseas SIM and eSIM services tailored to different regions and user needs.

How to Choose Overseas SIM Services by Major Regions

Did you know that the optimal service varies depending on the region you visit when choosing an overseas SIM or eSIM? It is important to consider the following three points.

Point 1: Price Competitiveness
Even with the same data capacity, prices can vary significantly between services. Especially in popular destinations like Asia and Hawaii, comparing prices across multiple providers is essential.

Point 2: Stability of Communication Speed
Whether video streaming and video calls are comfortable should be judged by actual measured speeds. Major locations like South Korea and Hawaii show large variations in actual speeds across different services.

Point 3: Ease of Avoiding Speed Restrictions Based on Usage
Some services impose speed restrictions before using up the data capacity, so it is important to assess the actual usable amount.

Ranking of Overseas SIM Services by Use Case

For those prioritizing high-speed communication

【1st Place】World eSIM (Vision) - Recommended Score: 4.68
A dedicated data communication eSIM service provided by Vision. Supports over 200 countries, with especially excellent speeds in Korea and Hawaii. Capable of streaming videos without restrictions even when using 15GB. The app offers a 10% discount, which is attractive. However, the pricing in Taiwan is relatively high.

【2nd Place】eSIM square (Telecom Square) - Recommended Score: 4.17
A service by Telecom Square supporting over 200 countries and regions. Speeds in Korea and Hawaii are sufficient for video streaming. No restrictions even with 15GB used in Korea. Korean SIMs are cheaper, but prices in Hawaii and Italy are higher. 24-hour Japanese chat support is convenient.

【3rd Place】Ubigi (Transatel) - Recommended Score: 4.21
A service provided by Transatel supporting over 200 countries. Excellent speeds in Hawaii, making video viewing comfortable. In Korea, restrictions are unlikely during a single day of video streaming. Flexible plans (7–30 days, monthly, yearly) are a plus. However, in Korea, SNS browsing may feel slow, and the lack of 3-day plans is a consideration.

For those prioritizing cost

【4th Place】Glocal eSIM (GlocalNet) - Recommended Score: 4.36
An overseas eSIM offered by GlocalNet. Flexible usage periods from 3 to 30 days. Supports video streaming in Korea with no restrictions even at 15GB. Very affordable in Thailand, also reasonable in Hawaii, Korea, and Taiwan. Supports 5G and Japanese customer support. However, speed drops at certain times in Hawaii, and prices in Italy are high.

【5th Place】airalo (AIRALO) - Recommended Score: 4.08
A service by AIRALO from Singapore supporting over 200 countries. Using a referral discount code can give a 15% discount. Cheapest in Korea, Hawaii, and Italy, and also inexpensive in Taiwan. Supports 53 languages and 24/7 support. However, speeds may be insufficient for video streaming, and there is no 3-day plan for Thailand.

【6th Place】Holafly - Recommended Score: 3.82
A service from Spain supporting over 120 countries. Offers unlimited plans and monthly/yearly plans. Reasonably priced in Korea, Taiwan, Thailand, Hawaii, and Italy, with speeds that make video streaming feasible even for one day. Discount system via HolaCoins is available. However, browsing sites may be slower.

【7th Place】DHA SIM (DHA SIM) - Recommended Score: 4.02
A service by DHA Corporation supporting both eSIM and physical cards. Cheapest in Taiwan, affordable in Korea and Hawaii. Ensures speeds suitable for video streaming. Limited supported countries but offers high cost performance where available. Lacks 3-day Thailand and 7-day Italy plans; browsing SNS and sites for long periods may face restrictions.

For balanced services

【8th Place】TRAVeSIM (a2network) - Recommended Score: 3.99
A prepaid service supporting over 140 countries by a2network. Supports 5G and offers Japanese support 24/7. Prices are low in Korea, Taiwan, Hawaii, and Italy. Has a track record of minimal restrictions during a single day of video streaming. However, speeds in Korea and Hawaii are somewhat lacking for video, and there is no 3-day plan for Thailand.

【9th Place】Trifa (Trifa) - Recommended Score: 3.72
An eSIM service supporting over 200 countries and regions by Trifa. Achieves speeds suitable for video in Hawaii, with no restrictions even at 15GB in Korea. Easy to purchase and activate via app, with 24/7 Japanese chat support. Offers a variety of short- and long-term plans. However, browsing SNS and sites in Korea can be slow, and overall prices are relatively high.

【10th Place】SkyeSiM (FREEDiVE) - Recommended Score: 3.71
A renewed version of “SkySiM” by FREEDiVE. Supports over 120 countries with flexible options for daily data and duration. Can be purchased easily from the website without an app. Relatively inexpensive in Hawaii. However, prices in Korea, Taiwan, Thailand, and Italy are higher, with no 7-day unlimited plan in Italy, and speed can be unstable depending on the time of day.

Final Checklist for Choosing an Overseas SIM

After evaluating multiple overseas SIM and eSIM services, it has become clear that the best choice depends on the region you visit. Recommendations differ depending on whether you prioritize high-speed communication or cost savings.

It is advisable to organize your planned regions, data usage, and priorities in advance, then compare prices and speeds across multiple providers. This approach is the key to choosing the right overseas SIM without regrets.