When traveling without wanting to pay your carrier's roaming fees, you have two popular options: the travel eSIM (data directly on your mobile) or portable WiFi (an external device that creates a hotspot). The differences are greater than they seem, and choosing the right one can save you money and hassle.
How Each Option Works
| Aspect | Travel eSIM | Portable WiFi (Pocket WiFi) |
|---|---|---|
| Device needed | Only your smartphone (eSIM compatible) | Portable router + SIM/plan charge |
| How to purchase | Online, QR or app, no shipping | Rental/purchase + pickup or delivery |
| Connected devices | 1 (yours, or share hotspot) | 5–10 simultaneous devices |
| Extra weight / bulk | None (all on mobile) | 100–200g + extra charger |
| Independent battery | No (uses mobile's battery) | Yes (own battery, 4–12h) |
| Risk of loss | Minimal (it's digital) | High (it's a physical device) |
| Network security | High (direct connection) | Medium (shared WiFi) |
| Latency | Direct (~20-40ms) | +10-20ms extra due to WiFi hop |
Price Comparison
The cost analysis reveals why eSIM has rapidly gained popularity:
| Destination / Duration | eSIM (10 GB) | Portable WiFi (rental/day) | Total WiFi (7 days) | Savings with eSIM |
|---|---|---|---|---|
| Europe | €8.90 | €5–7/day | €35–49 | €26–40 |
| Japan | €11.90 | €6–9/day | €42–63 | €30–51 |
| USA | €12.50 | €7–10/day | €49–70 | €36–57 |
| Mexico | €7.90 | €4–6/day | €28–42 | €20–34 |
| Thailand | €9.90 | €3–5/day | €21–35 | €11–25 |
Speed and Performance
Performance tests show significant differences between both options:
Direct eSIM connection is generally faster than portable WiFi because it eliminates the additional WiFi hop. Portable WiFi can distribute that speed among several devices simultaneously.
Practicality and Convenience
| Situation | eSIM | Portable WiFi |
|---|---|---|
| Go to the bathroom without your bag | ✅ Stay connected | ❌ Lose connection |
| Router battery at 0% | ✅ Not affected | ❌ No internet until recharged |
| Forget the router at the hotel | ✅ Not applicable | ❌ No internet and possible rental fine |
| Want to use 3 devices | ⚠️ Hotspot from mobile (uses extra battery) | ✅ Connects easily |
| 2-week trip | ✅ One plan, ready to go | ⚠️ Daily router charging |
| Hiking trail | ✅ Only carry your mobile | ⚠️ An extra device in the backpack |
| Banking security (2FA) | ✅ Direct and private connection | ⚠️ Shared WiFi, less secure |
For Groups and Families
This is the scenario where portable WiFi makes the most sense. A portable router can connect 5–10 devices simultaneously, while an eSIM covers only 1 main device (with hotspot as an alternative that consumes battery).
Cost analysis for a family of 4 (2 adults + 2 children with tablets):
- 4 individual eSIMs: €35–50 for 7 days
- 1 portable WiFi + 4 individual eSIMs without sharing: €70–100
- 1 portable WiFi only: €35–49 for 7 days (the most economical if everyone is content with WiFi)
For a family that wants everyone to have independent connectivity, a combination of individual eSIMs is often similar in price to portable WiFi, with the advantage that each person maintains their connectivity even if they separate from the group.
When to Choose Each Option
Choose eSIM when:
- You travel alone or as a couple without needing to connect many devices
- Your mobile supports eSIM and you want the simplest solution
- You prioritize price, lightness, and don't want to carry an extra device
- You do activities where you don't want to carry more luggage
Consider Portable WiFi when:
- 3+ people are traveling and all need simultaneous connectivity
- You have devices without eSIM (laptop, old tablet)
- You are in a destination where portable WiFi rental is very cheap (Japan, Korea)
- You need to connect a laptop for work without using your mobile's hotspot
Conclusion
For the vast majority of individual or couple travelers, eSIM is clearly superior: cheaper, more convenient, no extra devices, no risk of losing anything, and faster direct connection.
Portable WiFi retains its usefulness for large groups, for connecting tablets or computers without eSIM, or in Japan where pocket WiFi rental is a mature and well-priced option. In other cases, eSIM has made portable WiFi obsolete for the modern traveler.
FAQ: eSIM vs Portable WiFi
Can I use eSIM as a hotspot for my laptop?
Yes. You can activate your mobile's personal hotspot and connect your laptop via WiFi. The difference from portable WiFi is that you use your mobile's battery. For long work sessions, a portable charger solves the problem.
Is rented portable WiFi in Japan better than eSIM?
In Japan, rented pocket WiFi offers excellent speeds and competitive prices. For family trips or if you connect multiple devices, it can be the best option. For solo travelers, eSIM is generally more convenient and similar in price.
Is there a security risk using portable WiFi?
Portable WiFi creates a WiFi network that, if not well protected, could be accessible by third parties. With eSIM, data travels directly over the mobile network with native encryption, without passing through an intermediate device.
What happens if I lose the rented portable WiFi router?
Almost all rental agreements have a penalty for loss, which typically ranges from €100–300 depending on the provider. With eSIM, there is no physical device to lose.
Can I buy my own portable WiFi and use it forever?
Yes. An unlocked portable router costs €40–80, and then you insert local SIMs from each country. It can be cost-effective if you travel very frequently. But it still requires buying SIMs in each destination, management, and carrying an extra device.
