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For most trips to Nepal, the eSIM decision comes down to how far off the grid you're actually going. A 4G data-only eSIM like co:sim's Nepal plan covers Kathmandu, Pokhara, Chitwan, and the highways between them without any trouble, and it installs before you fly so it's already active the moment you land at Tribhuvan International Airport. What no eSIM, physical SIM, or roaming plan can promise is a signal once you're several days up the Everest Base Camp trail — and this guide is honest about exactly where that line sits. Below: what to look for in a Nepal eSIM, how the plans compare, which network actually covers which parts of the country, and precisely how far up the mountain your phone will still connect.
Four things matter more than the marketing copy on any plan page:
Nepal's plan lineup breaks into a few practical tiers. Here's how they stack up against the alternative of buying a physical SIM at the airport:
| Option | Data shape | Best for | Trade-off |
|---|---|---|---|
| Short fixed-total (7 days) | Set GB total, expires after a week | Long weekend in Kathmandu or Pokhara | Least flexible if your trip runs long |
| Standard fixed-total (30 days) | Larger GB total, a month of validity | Multi-city trip or a short trek | Data is capped, not a daily reset |
| Daily-allowance (FUP) | Fixed GB per day, speed drops (not cuts off) once hit | Multi-week treks needing daily connectivity | Slower speed after the daily cap, not zero |
| co:sim data-only eSIM | Any of the above, network + validity shown per plan | Anyone who wants the QR code before they fly | Data-only — no Nepali phone number for calls or SMS |
| Physical SIM at the airport | Carrier-set bundles, bought on arrival | Travelers who specifically need a local phone number | Passport, a photo, and a registration form at the arrivals-hall counter |
Ncell and NTC both run SIM counters just past baggage claim at Tribhuvan International Airport, and buying there means filling out a form and providing a passport-size photo — the counters will take one on the spot for a small fee if you don't have one, per Gigago's airport SIM guide. An eSIM skips that queue entirely: it can be installed at home before departure and simply switched on after landing.
Browse current Nepal eSIM plansNepal's mobile networks are 4G — there is no 5G rollout to speak of yet, so don't expect 5G marketing claims to hold up here. Nepal Telecom has pushed 4G furthest into rural territory: as of the operator's own coverage data, NTC's 4G now reaches 749 of Nepal's 753 local administrative levels nationwide, according to Nepali Telecom. Ncell, by contrast, has historically concentrated its strongest 4G in Kathmandu, Pokhara, and the other major cities, with Nepal Telecom holding a rural-coverage edge outside them, per Merokalam's carrier comparison. A co:sim Nepal eSIM connects to Nepal Telecom's or Ncell's 4G network depending on local signal, which is exactly why "nationwide coverage" numbers can be true and still miss the one canyon or ridge you're standing in.
That distinction matters most in the mountains, which is also where the marketing on some competing eSIM pages quietly stops being accurate.
Not above Namche Bazaar, reliably, and no provider, co:sim included, can promise otherwise. Ncell's signal is strong through Lukla and Namche Bazaar (3,440 m), stays usable as far as Tengboche, and then fades noticeably; multiple trekking guides place the point where it becomes patchy or disappears at Dingboche, one day's walk past Tengboche, per Nepal Hiking Team's connectivity guide. Nepal Telecom generally holds on a little longer thanks to a tower as far up as Gorak Shep, the last village before Base Camp, according to Merokalam — but that signal is inconsistent, not a guarantee, and neither network is expected to reach Everest Base Camp itself (5,364 m).
Above that point, trekkers rely on Everest Link, a dedicated satellite internet service founded in 2014 that runs on solar-powered towers between Lukla and Base Camp and is the only internet provider physically at Base Camp, per Wikipedia's entry on the service. It sells prepaid data cards at teahouses in Namche Bazaar and Dingboche, and most lodges from Phakding upward also run their own satellite Wi-Fi, billed per session or per day. Expect it to handle messaging and photo uploads, not video calls — bandwidth is shared across however many trekkers are online in that teahouse that evening.
The honest packing advice: buy your eSIM or SIM for Kathmandu, the flight to Lukla, and the lower valley (Lukla through Namche and Tengboche), and carry Nepali rupees for an Everest Link card or a teahouse Wi-Fi password once you're past that point. Treat any competitor's claim of "tested and working at Base Camp" with real skepticism unless they can point to which of the two systems above actually delivered it.
co:sim TeamSettings → Cellular → Add eSIM → Use QR Code. On Android: Settings → Network & internet → SIMs → Add eSIM. Check the plan's own install deadline and billing-start rule before you leave home — each plan page states both up front.Compare that against the airport SIM counter: passport, a photo, a paper form, and sometimes a thumbprint, all after an international flight. The eSIM route front-loads that five minutes of admin to whenever you had spare Wi-Fi at home.
If your trip extends beyond Nepal (a Kathmandu-Lhasa overland leg, a stop in Bhutan, or a wider South Asia loop), a regional Central & South Asia eSIM covers the group of neighboring destinations on a single plan instead of buying a fresh eSIM at every border.
Not reliably, and that's true of every provider, not just co:sim. Nepal Telecom and Ncell's 4G networks are strong through Lukla and Namche Bazaar, patchy by Tengboche and Dingboche, and not expected to reach Everest Base Camp itself (5,364 m), based on multiple Everest region trekking guides. Above that range, connectivity comes from Everest Link, a solar-powered satellite network built specifically for the Khumbu region, and from individual teahouses' own satellite Wi-Fi, both sold separately from any mobile data plan. A co:sim Nepal eSIM is the right tool for Kathmandu, the Lukla flight, and the lower valley — it just isn't the tool for the final days of the trek, and no honest provider should tell you otherwise.
4G. Nepal Telecom and Ncell both run 4G LTE networks nationwide, and there's no public 5G network live in the country yet, so any eSIM or SIM marketing that implies 5G speeds in Nepal is describing a network that doesn't exist here. Nepal Telecom's 4G reach is broader across rural districts, reportedly reaching 749 of Nepal's 753 local administrative levels, while Ncell has traditionally been strongest in Kathmandu, Pokhara, and other major cities. In practice, 4G speeds in the Kathmandu Valley and Pokhara are comparable to a mid-range Western city on a good day, but drop noticeably once you're on secondary roads or in hill districts. A data-only eSIM connects to whichever of the two networks has usable signal in your location, which in practice means solid, fast 4G in cities and along highways, and a steadily weaker signal the further you climb into the mountains.
An eSIM is enough for data, but it's data-only: it doesn't come with a Nepali phone number, so you can't receive calls or texts on it the way a physical SIM allows. If you specifically need a local number (to give a trekking agency, a hotel, or a permit office contact), a physical SIM from the Ncell or NTC counter at Tribhuvan International Airport still wins there, though it costs you the passport-and-photo registration process on arrival. For everything else, including maps, messaging apps, checking accommodation, and sharing photos, a data-only eSIM like co:sim's Nepal plan covers it, installs before you fly, and skips the airport paperwork entirely. Many trekking agencies also carry a local SIM for their own guides, so a personal Nepali number is less essential than it first sounds unless you're traveling independently.
For a two-week Nepal trip mixing city time (Kathmandu, Pokhara) with day hikes, most travelers are comfortable with a mid-size fixed-total plan covering maps, messaging apps, photo uploads, and moderate social media use. Heavy streaming or video calls push that estimate up quickly, since Nepal's average mobile speeds sit well below what you'd get on Wi-Fi at home, and many hotels and cafes in Kathmandu and Pokhara offer their own Wi-Fi that can absorb the heavier tasks. If part of the two weeks is a multi-day trek where you mainly need daily maps and messaging rather than streaming, a daily-allowance plan that throttles instead of cutting off once you hit the cap is usually the better fit than a single large fixed-total block, since it keeps working at a slower speed rather than leaving you with zero data on your last trekking day.
With co:sim, an uninstalled eSIM can be refunded within 30 days of purchase, though that window is also capped by the plan's own install deadline, and plans that bill immediately at purchase rather than on first connection are excluded entirely, so check the specific plan page before buying if this matters to your trip. Once an eSIM has been installed, it's no longer eligible for a self-service refund, even if you never actually connected to a network with it. This is why it's worth deciding your Nepal itinerary (city-only versus a trek that goes well past Namche Bazaar) before installing, rather than installing every plan "just in case" and hoping to undo it later once your route is clearer.
Neither wins outright — it depends on where you are. Ncell tends to have faster 4G in Kathmandu, Pokhara, and other cities, while Nepal Telecom has pushed its 4G network into more rural districts and holds on slightly longer at altitude on trekking routes like Everest Base Camp, according to carrier-comparison reporting from Merokalam. A data-only eSIM that can use either network sidesteps the choice for city and highway travel; the meaningful difference between the two only really shows up once you're well outside cellular-dense areas, where neither is guaranteed anyway.
Compare current Nepal eSIM plans before you fly, and treat any promise of coverage above Namche Bazaar with the skepticism it deserves — the mountain, not the marketing, decides where your phone stops working.
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