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OneSimCard review: Everything you need to know
Learn about OneSimCard’s international SIM and eSIM plans, including their pricing, coverage, refund policy, and pros and cons with this OneSimCard review.
OneSimCard is an international cell phone service provider that has been serving users since 2007. In this OneSimCard review, we discuss various SIM and eSIM plans, pricing, coverage, and refund policies, so you can decide for yourself if OneSimCard is the best option for you.
We also discuss Holafly as an eSIM alternative if you require a more flexible, data-focused solution for your travels.
Skip the sign-ups
Pick your plan and make your purchase. With Holafly, you don't need to create an account for your eSIM.
What is OneSIMCard?
OneSimCard is a global SIM provider offering pay-as-you-go mobile service with voice, text, and data coverage in over 200 countries. You can choose from eSIMs and physical SIMs depending on your device and travel needs.
Established in 2007 by its parent company, Belmont Telecom Inc., its products are sold on the OneSimCard website and in-flight on Malaysia Airlines and Virgin Atlantic.
Disclaimer: The data in this comparison is accurate as of July 8, 2025, and is subject to change.
OneSimCard review: The details
This OneSimCard review breaks down OneSimCard’s key features, so you know exactly what you’re getting.
SIM plans and pricing
OneSimCard offers data, call, and SMS services with its international SIMs and eSIMs.
You can order their international SIM cards online and have them shipped to you before your trip. When you activate them, you can access low flat rates for calls, texts, and data. These SIMs include two phone numbers: one European and one from a country you select, such as the US, UK, Canada, or Australia.
Their eSIMs, on the other hand, offer a fast and convenient way to get data connection without waiting for physical delivery. They work with eSIM-compatible phones and can run alongside your regular SIM card.
To make things easy for you, we compiled a list of their main SIM and eSIM products, including their respective features and rates.
| Product name | DataMax | DataMax eSIM | Universal SIM | Expedition | eSIM World |
|---|---|---|---|---|---|
| Service | Global data, voice, and SMS | Global data, voice, and SMS | Global data, voice, and SMS | Global data, voice, and SMS | Global data, voice, and SMS |
| Type | Physical SIM card | eSIM | Physical SIM card | Physical SIM card | eSIM |
| No. of countries covered with voice and SMS | 200+ (SIM VOIP) | 200+ (SIM VOIP) | 180+ | 200+ | 160+ |
| No. of countries covered with data services | 200+ | 200+ | 140+ | 170+ | 130+ |
| Price | $19.95 | $4.95 | $29.95 | $34.95 | $9.95 |
OneSimCard uses a pay-as-you-go model. There are no monthly contracts, and you can purchase a SIM and then top it up with credit or a specific plan. Data packages vary by region, country, and volume.
They also offer additional products, including international cell phone rentals, corporate accounts for businesses, and various data packages.
Coverage
OneSimCard offers coverage in over 200 countries and territories for its international SIMs, while its eSIMs provide data coverage in more than 130 countries.
Refund policy
OneSimCard’s refund policy is as straightforward as it gets. To put it simply, you can get a refund if:
- You return an unused SIM card or phone within 30 days
- The item is still in brand-new condition, with all packaging and accessories
- You haven’t used any airtime (calls, texts, or data)
- You ask for a return merchandise authorization (RMA) and write the RMA number clearly on the box
Note: A 25% restocking fee applies, and shipping won’t be refunded
You can’t get a refund for:
- Any airtime used (even if misdialed or undelivered)
- SMS messages, whether delivered or not
- Calls made to Customer Service
- Expired SIM cards or balances
- Canceling your account with leftover credit
- Not recharging your SIM within 10 months of your last top-up
You are advised to contact OneSimCard customer support for further assistance with your OneSimCard refund request.
Customer support
OneSimCard has 24/7 live chat customer support available on its website. You can also send a ticket to their customer support for any concerns or inquiries, such as how to use the product, troubleshooting, and general service questions.
The provider also has a section for frequently asked questions and other support pages for topics such as checking for phone compatibility and using country codes, which can be helpful for setting up your SIM.
OneSimCard pros and cons
Here’s a quick roundup of OneSimCard’s pros and cons to summarize this OneSimCard review:
| Pros | Cons |
|---|---|
| Covers up to 200+ countries | Refund policy is strict and includes a 25% restocking fee |
| Packages can include SMS and calls | Website layout can be hard to navigate for new users |
| Plans include both physical and virtual SIM cards | eSIM coverage is more limited compared to that of a physical SIM |
| Offers free incoming calls in 120+ countries | Shipping required for physical SIM cards |
OneSimCard is ideal for frequent international travelers who want a flexible, pay-as-you-go mobile solution that includes voice calls, SMS, and data.
It’s especially useful for those needing a secondary number while abroad, or anyone who travels across multiple countries and prefers not to rely on local SIMs in each destination.
Business travelers, digital nomads, and individuals requiring both voice and data capabilities across various regions may find OneSimCard a practical choice.
Get unlimited travel data with Holafly
If you’re looking for a simpler, data-focused option, Holafly is an excellent option. Holafly offers unlimited data plans in over 200 destinations, with instant eSIM activation — no physical delivery required.
With Holafly, you also get 1 GB of Always On backup data with every eSIM purchase. Simply keep the Holafly eSIM installed on your device to stay connected whenever travel gets difficult.
Holafly also offers 24/7 customer support, and while it doesn’t support voice calls or SMS like OneSimCard does, you can still enjoy unlimited calls and texts via VoIP apps. Holafly is a great pick for travelers who want a stress-free, unlimited data experience wherever they go.
Don't miss out on a discount
Use the code MYESIMNOW5 to get a discount of 5% off your next order.
Discover how OneSimCard compares to other international eSIM providers in our reviews of these alternatives to OneSimCard and Holafly:
- Airalo eSIM review
- Nomad eSIM review
- Saily eSIM review
- Ubigi eSIM review
- GigSky eSIM review
- Flexiroam eSIM review
- SimOptions eSIM review
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Hi, I'm Mika, a South Korean writer living in the US. I cover travel and live events, focusing on the practical stuff that makes your trip smoother, whether you're navigating a new city or heading to a major international event.I'm also the founder of <a href="https://search-seoul.com/" target="_blank" rel="noopener">Search SEOul</a>, South Korea's leading SEO conference, bringing together search marketing experts and speakers from around the world. 안녕하세요, 미국에 거주 중인 여행 콘텐츠 라이터 미카입니다. Holafly에서 여행과 이벤트에 관련된 글을 쓰고 있어요. 여러분이 낯선 도시를 여행하든 대규모 국제 이벤트에 가든, 여러분의 일정이 좀 더 매끄러워질 수 있도록 실용적인 정보를 다루고 있습니다. 그리고 저는 한국을 대표하는 SEO(검색엔진최적화) 컨퍼런스 <a href="https://search-seoul.com/">Search SEOul</a>을 만들었고, 해당 컨퍼런스의 호스트이기도 합니다. 서치 서울은 전 세계 검색 마케팅 전문가와 연사들이 모이는 자리입니다.
