Updated September 30, 2026 · TariffCue Editorial Team
KnowRoaming vs USIMS
Where KnowRoaming and USIMS differ
| Compare |  KnowRoaming |  USIMS |
|---|---|---|
| Seller type | Reseller | Mvno |
| Price from | $1.75Lower | $2 |
| Reference plan prices | USA Unlimited 30 Days: US $68.00, unlimited data, prepaid 30 days (no 12-month 30 GB+ SIM-only plan offered); USA Unlimited 1 Day: US $3.50, unlimited data, prepaid 1 day; USA 1 GB 7 Days: US $3.89, 1 GB, prepaid 7 days | 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 |
| Roaming countries | from 200 | 120 |
| Unlimited plan price | $3.50 | Not confirmed |
| Mid-contract price rises | Not confirmed | Charges may be changed at any time without notice, with changes posted on the mobile app and website |
Same on both: SIM-only (Yes), eSIM (Yes).
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Key differences
- KnowRoaming scores higher overall: 9.1 vs 9.0.
- Price from is lower at KnowRoaming: $1.75 vs $2.
- Support channels: only USIMS offers Email, Chat.
Our verdict on each
KnowRoaming
KnowRoaming sells prepaid sim-only eSIM data for travellers who want to buy a plan, use it and walk away, and the USA Unlimited daily plan at $3.50 makes a single heavy-use day cheap. Coverage spans from 200 countries, though the monthly unlimited option is where the range gets expensive.
USIMS
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.
Score breakdown
| Area | KnowRoaming | USIMS |
|---|---|---|
| Cost | 9.5HigherEntry price of $1.75 and unlimited data at $3.50 put KnowRoaming near the front of both price measures. | 9.3Entry is $2 with prepaid billing, and the plan list is built from short validity data packages. |
| Offer | 8.7Sim-only eSIM plans across from 200 countries, sold on prepaid billing by the day. | 8.8HigherSim only and eSIM are both offered, and support runs on email, chat and help centre for setup and help. |
Licences and countries
| Country | KnowRoaming | USIMS |
|---|---|---|
| Headquarters | Not confirmed | Switzerland |
By the numbers
| Fact | KnowRoaming | USIMS |
|---|---|---|
| Price from | $1.75 | $2 |
| Roaming countries | from 200 | 120 |
Where they rank in our lists
| Ranking | KnowRoaming | USIMS |
|---|---|---|
| Phone plans with eSIM | 8 of 389 | 9 of 389 |
Every fact side by side
| Fact | KnowRoaming | USIMS |
|---|---|---|
| Billing | Prepaid | Prepaid |
| Legal entity | Not confirmed | WONE SAGL |
| Headquarters | Not confirmed | Switzerland |
| Support channels | Help centre | Email, Chat, Help centreCovers more |
Where each stands against the rest
| Fact | KnowRoaming | USIMS | Median |
|---|---|---|---|
| Price from | $1.75below the median | $2below the median | $5 |
| Unlimited plan price | $3.50lowest quarter | Not confirmed | $25 |
| Roaming countries | from 200highest quarter | 120above the median | 100 |
Median across 176 listed providers.
Pros and cons
KnowRoaming
Pros
- Both sim-only and eSIM are offered, so nothing is posted and no store visit is needed, which suits a traveller already carrying a compatible handset.
- Coverage of from 200 countries lets a multi-stop trip stay with a single provider instead of changing SIMs at each border.
- Billing is prepaid, so every purchase is a set figure with no renewal step and no minimum term to serve out.
Cons
- Support runs on help centre only, so a connection that fails overnight leaves a help centre to sort it out.
- KnowRoaming is a reseller rather than a mobile virtual network operator, so a network fault has to be traced through another party; co:sim and BambooSIM answer as their own operators.
- The monthly USA Unlimited option costs many times the entry figure of $1.75, so a full month of heavy use is the expensive end of the range.
USIMS
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.
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.
Who each suits
KnowRoaming
Who it suits
- Travellers already holding a compatible handset who want data only, bought digitally with no delivery wait.
- Anyone covering a multi-country trip from a single provider, given coverage of from 200 countries.
- Readers who plan a trip day by day and want unlimited data for a single heavy-use moment rather than a capped monthly allowance.
Who should look elsewhere
- Readers who would rather deal with the network's own operation, since co:sim and BambooSIM run as mobile virtual network operators.
- Shoppers who want the lowest starting figure, since ESIMZON starts at $1 against KnowRoaming's $1.75.
USIMS
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.
Current offers
USIMS
Current offer
Free trial
Free 1 GB trial data for USA and Europe: 1 GB free
Included with USIMS eSIM plans for the USA and Europe
Source, checked September 30, 2026
Bonus
Free eSIM for first-time users: Free eSIM, $1 to replace a deleted eSIM
Free for first time users and buyers of any data plan; a new eSIM costs $1 if the previous one was deleted
Source, checked September 30, 2026
Questions about each
KnowRoaming
What does a KnowRoaming plan cost to start with?+
KnowRoaming's eSIM data plans start at $1.75, the entry figure for its lightest option. It is a set price rather than an introductory rate that renews higher, and billing is prepaid, so a reader can work out the whole spend for a trip before buying anything.
How much does unlimited data cost?+
The USA Unlimited daily plan is $3.50 for a full day of unlimited data, which is the figure most useful for anyone planning a trip day by day. The monthly unlimited option is priced far above that, so longer stays work out better with a smaller allowance topped up alongside it.
USIMS
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.