For about a decade, pocket WiFi was the sensible answer. Local SIMs meant paperwork and a shop queue, roaming was frightening, and renting a small router that just worked when you landed was the least painful option available. Plenty of travellers still book one out of habit. The question worth asking now is whether the extra device still earns its place, because the alternative changed. A travel eSIM is a plan that installs into the phone already in your pocket, and it shares its connection to other devices the same way the router does. This guide compares the two honestly, including the cases where the rented router is still the better answer.
What a pocket WiFi actually is
A pocket WiFi, sometimes sold as portable WiFi or a MiFi, is a small battery-powered router with a mobile SIM inside it. It connects to a local mobile network exactly the way a phone does, then rebroadcasts that connection as a private WiFi network for your devices to join.
That's the whole idea, and it's a good one. Your phone, your partner's phone, a laptop and a tablet all connect to one box, and none of them need their own plan or any settings changed. For a family landing in an unfamiliar country, the appeal is obvious.
A travel eSIM does the same job from the other direction. Instead of a separate radio in your bag, the plan installs directly onto your phone, and your phone becomes the thing that shares the connection. The network underneath is the same in both cases: both are riding on local carriers, so neither is inherently faster than the other.
So the real comparison isn't about signal quality. It's about whether you want a second device in the equation, and what that device costs you in money, admin and attention.
The device you have to collect, charge and give back
The rental is a physical object, and physical objects come with obligations. You collect it, usually from an airport counter, a courier delivery to your first hotel, or a locker. Then at the end of the trip you have to give it back, on time, in the country you rented it in.
That return deadline quietly shapes your last day. If your flight leaves at dawn or the counter has closed by the time you reach the airport, the return becomes a small logistical problem sitting on the least flexible day of the trip. Late returns are usually chargeable, and the deposit taken at the start is what makes that easy to enforce.
Then there's the battery. A pocket WiFi typically runs somewhere around a working day on a charge, which sounds fine until you compare it with an actual day of travel. You now have two devices to keep alive instead of one, and if the router dies at four in the afternoon, everyone connected to it loses internet at the same moment.
None of this is a dealbreaker on its own. It's just a running cost paid in attention rather than money: a thing to carry, a thing to charge, a thing that can be left in a hotel room, and a thing you owe someone.
Sharing: where pocket WiFi genuinely wins, and where it doesn't
This is the honest case for the rental, and it's a real one. One router covers everybody. Four people and a laptop can share a single rental, and nobody has to install anything or think about which plan is on whose phone. For a group travelling as a unit, that's genuinely simpler.
The limitation is range, and it matters more than people expect. WiFi from a pocket router reaches roughly across a hotel room. It does not reach across a market, a museum, or a train platform. The moment your group splits up, one person is carrying the internet and everyone else has none, which is precisely when a group most needs a way to find each other.
That's why the answer often depends on how your group actually moves. A family sharing a hotel room and travelling together all day is well served by one connection. Four adults who intend to explore separately and meet for dinner are not, and they'll discover it at the worst moment.
A phone hotspot has exactly the same range limit, which is worth saying plainly. The difference is that with eSIMs the fallback is better: if one person wanders off, they can still have their own small plan on their own phone, and nobody is stranded because the person holding the box went a different way.
The cost shape is different, not just the number
Comparing headline prices misses the point, because the two products are billed on completely different shapes. Pocket WiFi is rented per day. You pay for every calendar day you hold the device, including the day you barely leave the hotel, the day you spend on a train with no signal, and often the day you fly home before returning it.
Prepaid travel data is billed by amount instead. You buy a quantity of data with a validity window, and a quiet day simply consumes less of it. The trip length stops being the thing you're paying for and the usage becomes the thing you're paying for.
There are usually extras attached to the rental that don't appear in the daily rate: a deposit held against loss or damage, an optional insurance or damage waiver offered at the counter, and a charge if you return it late or without its cable. They're not unreasonable, but they're part of the real total and they don't have an equivalent on the eSIM side.
The pattern that emerges is fairly consistent. The more people you're covering, the better the rental looks. The longer the trip and the lighter the use, the better prepaid data looks. A single traveller on a two-week trip is the clearest case against renting hardware.
Crossing borders
A rented router is usually tied to the country you rented it in, because that's where you have to give it back. That constraint is invisible on a single-country trip and awkward on any other kind.
If your itinerary crosses borders, you're choosing between a global rental at a higher daily rate, renting a second device in the next country, or accepting that the box only works for part of the trip. None of those is fatal, but all of them are friction that a single regional data plan doesn't have.
An eSIM handles this differently because nothing has to be returned anywhere. A regional plan covers a fixed list of countries from one install, and crossing a border is just the phone reconnecting to a partner network. If you'd rather not think about coverage lists at all, several plans stretch across whole continents.
It's also worth remembering that you can carry more than one eSIM. A plan for the country you're spending most of your time in, plus a small one for the side trip, is a normal setup and costs nothing to keep installed.
When pocket WiFi is still the right call
There are real situations where the rental wins, and pretending otherwise would be useless to anyone actually deciding.
The clearest is a phone that can't take an eSIM at all. Older handsets, some regional model variants, and phones bought on certain carrier contracts either lack eSIM support or have it disabled. A carrier-locked phone is the same problem in a different form: it will refuse an eSIM that isn't its own carrier's. In both cases a rented router sidesteps the issue entirely, because it doesn't care what your phone is.
The second is genuine multi-device work. If you're travelling with two laptops, a tablet and a camera that uploads, a dedicated router with its own battery is a more sensible hub than one phone trying to serve everything while also being your phone and your map.
The third is a large group that really does stay together, like a family with young children moving as one unit all day. And the fourth is simply preference: some people don't want to touch phone settings on holiday, and a box that arrives working is worth paying for. That's a legitimate reason, not a mistake.
- Your phone doesn't support eSIM, or is locked to a carrier
- You need to connect several laptops or working devices at once
- A large group that genuinely stays together all day
- You'd rather not change any settings on your own phone
- Your phone's battery is already struggling and you don't want it hotspotting
How to share an eSIM connection instead
If you decide the extra device isn't worth it, sharing from your phone is the direct replacement, and every Lumbus plan supports hotspot and tethering. Your phone becomes the router: other phones, tablets and laptops join its hotspot exactly as they would join the rental's WiFi.
The thing to plan for is that a laptop is not a phone. Connect one and it treats the link like home broadband, syncing cloud storage, pulling system updates and keeping dozens of tabs alive. If you intend to work off a hotspot, budget at least double the data you'd expect from phone use alone.
On unlimited plans, hotspot is included and draws from the same daily full-speed allowance rather than a separate one, so shared devices bring you to the reduced speed sooner. That's fine for messaging and maps, and it's not a way to run video calls all afternoon for a room full of people.
Battery is the honest trade. Hotspotting drains a phone noticeably faster, so a small power bank does the job the router's battery would have done, weighs less, and is useful for the rest of your trip too.
For a family, the setup most people land on is a mix: one larger plan on whoever's phone will do the sharing, and small plans on everyone else's phones as insurance for when the group splits up. It costs a little more than one rental and removes the single point of failure.
Frequently asked questions
Is an eSIM better than pocket WiFi?
For most solo travellers and couples, yes, mainly because there's no device to collect, charge or return and no deposit involved. Pocket WiFi keeps a genuine advantage for larger groups moving together, for connecting several laptops at once, and for anyone whose phone doesn't support eSIM or is carrier-locked. Neither is faster than the other, since both ride on the same local networks.
Can I share an eSIM with other people?
Yes, through your phone's hotspot. Every Lumbus plan supports hotspot and tethering, so other phones, tablets and laptops can join your connection just as they'd join a rented router's WiFi. The eSIM itself installs on one device only, so you're sharing the connection rather than the plan.
How many devices can connect to an eSIM hotspot?
That's set by your phone rather than by the plan, and most modern phones allow around five connected devices at once. In practice the limit you'll hit first is data and battery, not device count, since each connected device draws from the same allowance and hotspotting drains a phone quickly.
Does using hotspot use more data?
The hotspot itself doesn't add overhead, but the devices you connect usually use far more than your phone would. Laptops are the main culprit: they sync cloud storage, download system updates and keep many tabs open, all of which a phone does more sparingly. If you plan to work from a hotspot, budget at least double.
Is pocket WiFi cheaper than an eSIM?
It depends on group size and trip length, because the two are billed on different shapes. Pocket WiFi charges per day regardless of how much you use, plus a deposit and sometimes a damage waiver. A travel eSIM charges once for an amount of data, so quiet days cost nothing extra. Rentals get more competitive the more people share one; eSIMs get more competitive the longer and lighter the trip.
Do I need pocket WiFi in Japan?
No. Japan has excellent eSIM coverage, with plans running on the major national networks including NTT docomo, KDDI au, SoftBank and Rakuten Mobile, all offering 5G where available. Pocket WiFi became the default in Japan when tourist SIM options were limited, and that reason has largely gone. Rental still makes sense for a big group or if your phone doesn't support eSIM.
What happens if I lose a rented pocket WiFi device?
You're normally liable for it, which is what the deposit taken at the start is for. Most rental companies offer an optional damage or loss waiver at the counter, and the replacement cost without one can be substantial. It's the risk that doesn't exist with an eSIM, since there's no hardware to lose in the first place.
Does pocket WiFi work in more than one country?
Usually not, because the device has to be returned in the country you rented it in. Some providers offer multi-country or global devices at a higher daily rate. For a trip crossing borders, a regional eSIM covering a list of countries from a single install is generally the simpler arrangement.
Can I use an eSIM for my laptop?
Yes, in two ways. Most people share their phone's connection over hotspot, which works for any laptop. Some newer laptops have built-in eSIM support and can take a data plan directly, which avoids draining your phone. Either way, expect a laptop to use data considerably faster than a phone does.
Does hotspot drain my phone battery?
Yes, noticeably. Your phone is running its mobile radio and a WiFi broadcast at the same time, and it warms up and drains faster than normal use. A small power bank solves it and does the same job the rental router's battery would have done, with less to carry and nothing to return.