Updated September 30, 2026 · TariffCue Editorial Team
co:sim vs KnowRoaming
co:sim vs KnowRoaming: the differences
| Compare |  co:sim |  KnowRoaming |
|---|---|---|
| Seller type | Mvno | Reseller |
| Price from | $0.99Lower | $1.75 |
| Reference plan prices | Global (117 areas) unlimited daily data: $13.99, unlimited daily data, no contract, 1-365 days; Global (117 areas) 20GB 30 days: $135.99, 20GB total data, no contract; cheapest plan overall: single-destination Data Only eSIM from $0.99, data varies, no contract (no 12-month or 30GB+ plans listed) | 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 |
| Unlimited plan price | $13.99 | $3.50Lower |
| Roaming countries | 200 to 240 | from 200 |
| Host network | local carrier networks | Not confirmed |
| 5G | Yes | Not confirmed |
| Hotspot sharing | Yes | Not confirmed |
Same on both: SIM-only (Yes), eSIM (Yes).
We earn a commission when you sign up through links on this site. Partner status can affect where a brand appears in our rankings.
Key differences
- co:sim scores higher overall: 9.4 vs 9.1.
- Price from is lower at co:sim: $0.99 vs $1.75.
- Unlimited plan price is lower at KnowRoaming: $3.50 vs $13.99.
- Support channels: only co:sim offers Email, Chat, Phone.
Our verdict on each
co:sim
co:sim suits travellers who want a prepaid eSIM with wide reach and a low starting price, and plans open at $0.99. It is a data-only setup, so the eSIM, hotspot sharing and sim only options suit people who manage their own data rather than expect a handset with the plan.
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.
Score breakdown
| Area | co:sim | KnowRoaming |
|---|---|---|
| Cost | 9.5Entry pricing leads the set: $0.99 to open a plan and $13.99 for unlimited daily data, with no contract on either. | 9.5Entry price of $1.75 and unlimited data at $3.50 put KnowRoaming near the front of both price measures. |
| Offer | 9.2HigherWide reach with everyday extras: 200 to 240 countries covered, eSIM delivery, hotspot sharing and sim only plans, all prepaid. | 8.7Sim-only eSIM plans across from 200 countries, sold on prepaid billing by the day. |
How they place
| Ranking | co:sim | KnowRoaming |
|---|---|---|
| Phone plans with eSIM | 12 of 389 | 8 of 389 |
Which one suits you
Pick co:sim if offer and price from matter most.
Pick KnowRoaming if unlimited plan price matter most.
A third option
ESIMZON has unlimited plan price at $2.90, against $13.99 for co:sim and $3.50 for KnowRoaming.
ESIMZON reviewWhat we checked
co:sim
- cosim.io: 14 facts, checked September 30, 2026
KnowRoaming
- knowroaming.com: 9 facts, checked September 30, 2026
Every fact side by side
| Fact | co:sim | KnowRoaming |
|---|---|---|
| Billing | Prepaid | Prepaid |
| Legal entity | Comsand Inc. | Not confirmed |
| Headquarters | United States | Not confirmed |
| Support channels | Email, Chat, Phone, Help centreCovers more | Help centre |
Where each stands against the rest
| Fact | co:sim | KnowRoaming | Median |
|---|---|---|---|
| Price from | $0.99lowest quarter | $1.75below the median | $5 |
| Unlimited plan price | $13.99lowest quarter | $3.50lowest quarter | $25 |
| Roaming countries | 200 to 240highest quarter | from 200highest quarter | 100 |
Median across 176 listed providers.
Pros and cons
co:sim
Pros
- Entry at $0.99 puts co:sim at the front of the price ranking: 1 of 15.
- Reach of 200 to 240 countries with hotspot sharing, so one data plan can carry a phone and a laptop across a long route.
- Sim only eSIMs on prepaid billing, so nothing is locked into a contract before the trip: prepaid.
Cons
- Billing is prepaid only, so a long trip has to be bought and paid for up front rather than spread over a contract.
- Unlimited daily data costs $13.99 against an entry price of $0.99, so wide-area cover for a long route sits well above the figure a plan list opens with.
- Of the email, chat and phone on offer, phone is the least common: 18.8% of the listings here include it, against 93.8% for the help centre.
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.
Who each suits
co:sim
Who it suits
- Travellers crossing several countries who want a prepaid eSIM and hotspot sharing.
- People who plan their own data and pay as they go, since billing is prepaid with no contract attached.
- Anyone with an eSIM-ready handset who wants a sim only plan.
Who should look elsewhere
- Travellers after a named local partner in a single country, such as a Japan trip, where BambooSIM runs on Local partner networks, e.g. KDDI (au) and SoftBank in Japan.
- Shoppers who prefer a reseller setup, since ESIMZON is reseller and KnowRoaming is reseller.
- Buyers who want a monthly contract to renew: billing is prepaid, and the listed plans carry no contract.
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.
Current offers
co:sim
Current offer
Bonus
Free 1 GB eSIM for new customers: 1GB free eSIM valid 7 days at $0
New customers only, one per person; applied automatically at checkout, no code; sign-in with email and a valid payment card required for verification, nothing charged; 42 territories (one EU-33 roaming card plus 9 single-destination cards)
Source, checked September 30, 2026
Questions about each
co:sim
How much does a co:sim plan start at?+
The entry price is $0.99, and it belongs to a single-destination data-only eSIM rather than a wide-area plan. That makes it the figure that appears first in a plan list, but it is not the cost of staying online across a whole trip. Budget from the unlimited price for multi-country use.
How much is unlimited data on co:sim?+
Unlimited daily data costs $13.99. That plan covers a wide area list and runs without a contract, and it is the line most readers set against other sellers' unlimited plans. The gap between this figure and the entry price is the trade-off: unlimited removes the need to choose a data amount and moves the budget up.
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.