Global eSIM: 120 vs 139 Countries, and Why Bigger Is Not Broader

Global (139 areas) is not a bigger Global (120 areas). The two co:sim global eSIMs share 112 territories, but five sit only on the 120-area list and fifteen sit only on the 139-area list — so the higher number in the name does not contain the lower one. Vietnam and Cambodia are on 139 only; Mauritius, Armenia and Guam are on 120 only.

The number inside a plan name is the supplier's own "areas" label, and it does not have to equal the number of entries on the coverage list. Read the list, not the label. Below are the exact differences, the two plan ladders, and the honest question of whether either beats the roaming allowance you already pay for.

#Why isn't Global (139 areas) a superset of Global (120 areas)?

Each global bundle is assembled from its own set of wholesale agreements. When one of those agreements lapses or was never signed for a given market, that territory drops off one list while staying on the other. The result is two overlapping products rather than two sizes of the same product.

This is the opposite of how the pricing looks, which is why it catches people. The wider plan is the more expensive one, so the natural assumption is that it does everything the cheaper one does and more. On coverage it does not.

#Which territories are on only one of the two global plans?

Three patterns run through the right-hand column. First, Southeast and South Asia: Vietnam, Cambodia, Brunei and Bangladesh are all 139-only, which matters because a long-haul trip through the region is exactly when someone reaches for a global plan. Second, the Gulf and the Caucasus: Bahrain and Georgia. Third, islands and dependencies that travellers assume are folded into a mainland entry — Guadeloupe, Martinique, Réunion, Saint Barthélemy and Saint Martin alongside France; Isle of Man and Jersey alongside the United Kingdom; Åland alongside Finland.

The left-hand column is shorter but not trivial. Mauritius is a mainstream long-haul destination, Guam is a common Pacific stopover, and Armenia sits on plenty of Caucasus itineraries. For those three, the 120-area plan is the one that works between these two.

#Which global plan fits which trip?

#Does the route include Vietnam, Cambodia, Bangladesh or Brunei?

Then Global (139 areas) is the global option, because none of those four is on the 120-area coverage list. If the trip is mostly in that region rather than genuinely worldwide, compare a regional bundle first — a global plan earns its price by crossing continents, and a Southeast Asia bundle usually costs less per gigabyte for the same ground.

#Does it include Mauritius, Armenia or Guam?

Then Global (120 areas) is the one of the two that covers you. This is the case that breaks the buy-bigger instinct most cleanly: paying more for the 139-area plan would leave a Mauritius leg uncovered.

#Are you assuming a dependency is covered by its mainland?

Do not. Guadeloupe, Martinique, Réunion, Saint Barthélemy and Saint Martin are listed separately from France, Isle of Man and Jersey separately from the United Kingdom, and Åland separately from Finland — and all eight appear on Global (139 areas) only. The same caution applies to the roaming side: the European Commission's rules on roam like at home apply across the 27 EU member states plus Iceland, Liechtenstein, Norway, Ukraine and Moldova, and the Commission states plainly that the regime does not apply when you travel to the UK. Check the specific territory, never the flag.

#What do co:sim's two global plan ladders offer?

The absence of any daily plan on Global (139 areas) is the difference most people feel. If your pattern is heavy use in short bursts (a fortnight of conference days, a filming schedule, a week of tethering a laptop), the 120-area plan is the only one of the two that sells that shape, and it throttles rather than cuts off when a day's allowance runs out.

Both plans are reloadable, so you add data or validity onto the same profile without a reinstall and without a second QR code. Both are data-only: mobile data, no phone number, so calls and messages travel over apps. Every co:sim plan page states the host networks, the install deadline, whether validity begins at first connection or at purchase, and whether top-ups are supported — read those four fields on the plan itself.

#Does a global eSIM beat the roaming you already pay for?

Sometimes not, and saying so is more useful than pretending otherwise. Inside the European footprint, roam like at home means an EU or EEA subscriber pays domestic rates, so a global eSIM adds little for travel within that area. The caveat is the fair-use limit: the Commission confirms an operator may apply a fair-use data cap when roaming, must alert you at 80 per cent of it, and may charge above it: the surcharge started at €2 per GB plus VAT in 2022 and steps down to €1 per GB by 2027. A long trip on a small cap can exhaust that allowance early.

UK subscribers sit differently. The UK government states that surcharge-free roaming in EU and EEA countries is no longer assured since the transition period ended, while a £45-per-billing-period data spending cap and alerts at 80 and 100 per cent of your allowance remain in place.

Outside both footprints, the comparison usually swings the other way, because standard pay-as-you-go roaming rates for long-haul destinations are the expensive default. That is the trip a global plan is built for: several continents, one profile, one install.

One more honest limit. A global plan's coverage list spans very different networks. The ITU reports 5G now reaches more than half of the world's population and over a third of mobile broadband subscriptions, with coverage still clustered in high-income countries, and it publishes population-covered figures split by urban and rural area for the same reason. Budget data for the weakest leg of the route.

#FAQ

#Is Global (139 areas) a superset of Global (120 areas)?

No. The two coverage lists overlap heavily but neither contains the other. They share 112 territories. Five appear only on Global (120 areas): Armenia, the Central African Republic, Guam, Guinea-Bissau and Mauritius. Fifteen appear only on Global (139 areas), including Vietnam, Cambodia, Bangladesh, Bahrain, Brunei and Georgia.

The practical method is subtraction rather than addition. Write out every country and territory on your itinerary, open both plan pages, and strike out either plan whose coverage list is missing even one of them. If both survive, compare plan shape and price per gigabyte. If neither does, a regional bundle plus a single-country plan often covers the route for less than the wider global card. Run that check before you compare price rather than after, because a cheaper plan that misses one stop is not cheaper.

#Which global eSIM covers Vietnam?

Of these two, only Global (139 areas). Vietnam is absent from the Global (120 areas) coverage list, so the cheaper global card will not attach there no matter how long the rest of the trip is. Cambodia behaves the same way, which matters because the two are frequently travelled together.

Worth weighing before you buy the wider global plan for that reason alone: if Vietnam is a major part of the itinerary rather than one stop on a world trip, a Southeast Asia regional bundle or a Vietnam plan normally gives more data per dollar over the same ground. A global plan pays for breadth. When the breadth is not being used, you are buying coverage you will never attach to, and that is the most common way travellers overspend on an eSIM.

#Do co:sim's global eSIMs come with a phone number?

They do not. Both global plans are data-only: they carry mobile data and no phone number, so the plan itself cannot place a call or receive an SMS. Messaging and calling work over apps (WhatsApp, Signal, FaceTime, Telegram) exactly as they do on hotel Wi-Fi.

The one thing to plan around is SMS one-time codes. A bank or airline that texts a verification code will send it to your home number, so keep your usual SIM enabled for inbound messages and let the co:sim data plan carry everything else. That is the standard dual-SIM arrangement on any recent handset. Where a service offers an authenticator app or email codes as an alternative, switch before you travel rather than while standing at a check-in desk abroad.

#Is a global eSIM worth buying if I mostly travel inside Europe?

Usually not for travel within the European footprint, and that is a straight answer rather than a hedge. Roam like at home means an EU or EEA subscriber pays domestic rates in the 27 member states plus Iceland, Liechtenstein, Norway, Ukraine and Moldova, so there is little for a global card to improve on there.

Two situations change the answer. First, a fair-use data cap: your operator may limit roaming data, and a long trip can pass that limit well before the trip ends. Second, any leg outside the footprint (the UK, Turkey, North Africa, Asia, the Americas), where standard roaming rates apply. For a mixed itinerary, many travellers keep their home SIM for calls and codes and add a co:sim data plan for the non-European legs, which is cheaper than a global card bought for the whole trip.

#Can I extend a global eSIM without reinstalling it?

Yes on both plans, because both are reloadable. A top-up adds data or validity to the profile already on your phone, so there is no second QR code, no new profile to install and no gap in service while you switch.

That makes the long-window options practical for irregular travel: a 1 GB / 365-day card sits dormant on the phone and gets topped up when a trip appears, rather than being bought fresh each time. Validity on these plans begins at first connection rather than at purchase, so installing early does not start the clock. The one structural difference is shape, not top-ups: Global (139 areas) sells no daily-allowance plan at all, so if you want a renewing daily bucket, that is Global (120 areas). Install at home on Wi-Fi, check the coverage list against your route, and let a co:sim profile attach on arrival.