USIMS review

Updated September 30, 2026 · TariffCue Editorial Team · Facts checked September 30, 2026

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Our verdict

USIMS suits travellers who want prepaid data while away, with entry at $2 and roaming across 120 countries. The catch is what that entry buys: the published list holds no monthly, contract or unlimited tier, so a trip means buying a fresh package rather than renewing a set plan.

Key facts

Best for
Short prepaid data for trips, priced per package rather than per month.
Seller type
Mvno (Source, checked September 30, 2026)
SIM-only
Yes (Source, checked September 30, 2026)
Price from
$2 (Source, checked September 30, 2026)
Reference plan prices
No 12-month, unlimited or monthly plans; cheapest 10-day packages listed: France 10 GB: 9 USD, 10 GB, 10-day validity; United Kingdom 10 GB: 9 USD, 10 GB, 10-day validity; United States 10 GB: 15 USD, 10 GB, 10-day validity (Source, checked September 30, 2026)
eSIM
Yes (Source, checked September 30, 2026)
Roaming countries
120 (Source, checked September 30, 2026)
Mid-contract price rises
Charges may be changed at any time without notice, with changes posted on the mobile app and website (Source, checked September 30, 2026)
Legal entity
WONE SAGL (Source, checked September 30, 2026)
Headquarters
Switzerland (Source, checked September 30, 2026)
Support channels
Email, Chat, Help-centre (Source, checked September 30, 2026)
Billing
Prepaid
Official website
usims.com

Apps and profiles

Get the app
App StoreGoogle Play
Elsewhere
LinkedInX

Pros and cons

Pros

  • Roaming covers 120 countries, so a package list can carry a trip across several borders without swapping providers.
  • Sim only is available and eSIM is supported, so a new phone can be online without waiting for a card in the post.
  • Billing is prepaid, so there is no contract term to serve and nothing to close when a trip ends.
  • Support runs on email, chat and help centre, which gives you more than a single inbox to work with.
  • Ranked 6 of 15 brands on price from, USIMS sits mid-field rather than at either end.

Cons

  • A monthly or unlimited plan is not among its reference plan prices, which are prepaid data packages by country, and prepaid billing means each top-up is a fresh purchase rather than a renewal.
  • USIMS can revise charges and publish them in its app and on its site, so the entry price of $2 is not a figure you can plan a later top-up around.
  • Support runs on email, chat and help centre only, with no phone line listed for problems that cannot wait.
  • Entry at $2 is above $0.99 at co:sim, so the lowest starting figure on the site belongs to someone else.
USIMS

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Scored 9.0 / 10 by TariffCue.

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Who it suits

  • People crossing several borders and paying for data a package at a time rather than through a monthly bill.
  • Owners of a new phone who want data running straight away through an eSIM.
  • Buyers who treat the number as a travel tool and top up again when a package runs out instead of tracking a renewal date.

Who should look elsewhere

  • Shop-first buyers: ESIMZON and KnowRoaming are resellers, where USIMS is an mvno.
  • Anyone after unlimited data: the site median of €12.27 for unlimited plans comes from sellers that list them, and USIMS does not.
  • Travellers who need a rate held for the whole stay, since USIMS can revise charges and puts the new figures in its app and on its site.

Core features

USIMS sells connectivity rather than handsets, and sim-only is available, so the profile is not tied to a phone in a box. eSIM is supported, which means a traveller landing with a new phone can be working data before a card arrives, and the same packages run on a physical SIM for anyone who wants one. Roaming reaches 120 countries, so the real question for a multi-country trip is which of them you cross and whether the destination is on the list.

The company behind it

The brand is run by WONE SAGL, the legal entity named in the terms, with CH given as its country of registration. Support runs on email, chat and help centre, so help arrives by email, in a live chat or through a help centre, and a reader who wants a voice on the phone will not find one listed. Buyers here deal with a prepaid operation selling its own data packages, which suits people who are content to self-serve and leaves voice-first buyers looking elsewhere.

How USIMS compares

Where USIMS is available

Available
Everywhere except Belarus, Cuba, Israel, Iran, North Korea, Lebanon, Russia, Syria

Countries from the brand (Source, checked September 30, 2026)

Frequently asked questions

How much does USIMS cost to start?+

Entry is $2 and billing is prepaid, so you pay for a package rather than a monthly bill. The published data plans are short validity bundles bought per country, and there is no monthly, contract or unlimited tier on the list, which makes the top-up the whole commitment.

Is there a contract or a renewal price to check?+

There is no contract term, and the plan list has no monthly, contract or unlimited tier, so nothing renews on a schedule. Billing is prepaid: when a package runs out you buy another one at the current charge, and the terms let USIMS revise charges and publish them in its app and on its site.

Can I get an eSIM from USIMS?+

Yes, eSIM is offered, and sim-only plans are available as well, so there is no handset to unlock the offer. With prepaid billing, the eSIM is set up against a prepaid top-up, which suits a traveller who lands, buys a package and connects before a card arrives.

How many countries does USIMS cover?+

Roaming reaches 120 countries, which is the figure to test a route against. Plans are sold per country, so a trip through several of them means several packages rather than one plan, and the listed prices differ by destination.

How do I get help if a package runs out abroad?+

Support runs on email, chat and help centre, so email, chat and the help centre are the listed routes. There is no phone number in that set, which matters if a package expires mid-trip, and buying the next one relies on the app or the site rather than a call.

Who runs USIMS?+

The legal entity behind the brand is WONE SAGL, with CH given as its country of registration. Buyers are dealing with a prepaid operation selling its own data packages rather than a network storefront, which shapes both the support routes and how prices are set.

Can USIMS change its prices?+

Yes. USIMS can revise its charges whenever it wants, and the new figures land in its mobile app and on its website rather than behind a notice period. That makes $2 the entry price on the day you look, not a rate protected for the length of a stay.

How does USIMS compare with resellers such as co:sim, ESIMZON and KnowRoaming?+

USIMS is an mvno, while ESIMZON and KnowRoaming are resellers, so the sale comes from the operator's own MVNO side rather than a shop. co:sim lists a lower entry price at $0.99, so it sits lower on the starting figure, while USIMS covers 120 countries.

Sources

  • usims.com/contact-us checked September 30, 2026

    Backs: Support channels

    “Click on the support snippet in USIMS app and get online support via our Bot ... send us an email at cc@usims.com”

  • usims.com/data-plans checked September 30, 2026

    Backs: Reference plan prices

    “France Price: 9 USD Data: 10.0 GB Valid: 10 Days”

  • usims.com/faq checked September 30, 2026

    Backs: ESIM, Price from, Roaming countries, SIM-only

    “USIMS is a leading mobile app that offers mobile eSIM travel data plans worldwide without any roaming costs”

  • usims.com/terms-service checked September 30, 2026

    Backs: Billing, Headquarters, Legal entity, Mid-contract price rises, Seller type

    “USIMS DataSIM is a mobile prepaid eSIM or physical SIM that gives access to worldwide roaming-free data rates in more than 100 countries”

Compiled from 4 source pages, checked September 30, 2026. We did not open an account.

Not confirmed yet: Unlimited plan price, Contract length.

USIMS

USIMS

Short prepaid data for trips, priced per package rather than per month.

9.0/10Visit

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