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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.

In this article

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 devices 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.

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.