eSIM vs Pocket WiFi in Japan (2026): Which Is Better for UK Travellers?
Pocket WiFi used to be the default way to stay online in Japan. In 2026, an eSIM is cheaper, faster to set up, and works the moment you land at Narita or Haneda. Here's the full UK-traveller comparison.
Published 2026-06-12 · Updated 2026-06-12 · TripSIM Team
For a decade, Pocket WiFi was the obvious way to stay online in Japan. You'd pre-book a router, collect it from a Narita or Haneda counter, lug it around Tokyo and Kyoto, and post it back from the airport. In 2026 that workflow is finally outdated. A Japan eSIM activates the moment your flight lands, costs a fraction of a rental, and doesn't need a separate device or returns envelope.
Quick verdict: eSIM wins for almost every UK traveller
If your phone is from 2019 or later it almost certainly supports eSIM, and a TripSIM Japan plan starts at a fraction of what most Pocket WiFi rentals charge per day. The only travellers still better served by Pocket WiFi are large groups sharing one connection across many laptops, or anyone on an older phone with no eSIM support.
Side-by-side comparison
- Price: eSIM from a few pounds for a week; Pocket WiFi typically £5–£10 per day plus delivery and insurance.
- Setup: eSIM activates instantly via QR code; Pocket WiFi requires airport pickup queues and a return drop-off.
- Speed: Both use the same Japanese 4G/5G networks (Docomo, SoftBank, KDDI) — real-world speeds are comparable.
- Battery: eSIM uses your phone's battery only; Pocket WiFi adds a second device to charge each night.
- Coverage: eSIMs roam across all major Japanese networks; Pocket WiFi is locked to one carrier.
- Luggage: eSIM = zero hardware; Pocket WiFi = router, charger, pouch, return envelope.
- Refunds & loss: Lose a Pocket WiFi router and you'll pay £100+ replacement; an eSIM can't be lost.
When Pocket WiFi still makes sense
Families or business groups travelling together who need to share one hotspot across five or six devices may still get marginal value from a Pocket WiFi rental. The same is true for travellers carrying an older non-eSIM phone who don't want to swap their physical SIM. For everyone else, an eSIM is faster, cheaper and lighter.
How to set up a Japan eSIM before you fly
- Buy your TripSIM Japan plan before leaving the UK and download the QR code email.
- On home WiFi, open Settings → Mobile/Cellular → Add eSIM, then scan the QR code.
- Label the new line 'Japan' and set it to Data Only. Keep your UK SIM as the primary line for calls and texts.
- Turn data roaming ON for the Japan eSIM only. Leave roaming OFF for your UK line to avoid carrier charges.
- Land in Tokyo, connect to airplane mode off — you'll be online before you reach immigration.
Is an eSIM cheaper than Pocket WiFi in Japan?
Yes. A 7-day TripSIM Japan eSIM costs a few pounds, while typical Pocket WiFi rentals run £35–£70 for the same period once delivery and insurance are added.
Will a Japan eSIM work as soon as I land at Narita or Haneda?
Yes. Install the eSIM on UK WiFi before you fly. As soon as you take your phone off airplane mode in Japan, it connects to a local network automatically.
Can I keep my UK number while using a Japan eSIM?
Yes. Your UK SIM stays active for iMessage, WhatsApp and incoming calls. The Japan eSIM only handles mobile data — there's no number swap.
Does a Japan eSIM support tethering and hotspot?
Yes. TripSIM Japan plans support personal hotspot on iPhone and Android, so you can share data with a laptop or a travel companion just like a Pocket WiFi router.
Is the eSIM as fast as Pocket WiFi in Japan?
Real-world speeds are comparable because both use the same Japanese networks (Docomo, SoftBank, KDDI). Eligible phones on TripSIM also access 5G where the carrier supports it.