This is exactly the kind of pre-trip decision where "I'll just sort it at the airport" quietly costs you money. Mio doesn't care about convenience marketing — here's the math.
1. Travel eSIM — if your phone supports eSIM, this is the cheapest and fastest. You buy a data plan online, install it before you fly, and it activates when you land. Roughly ¥1,000–3,000 for a week with ~10GB (illustrative). No physical device, no counter queue, nothing to hand back.
2. Pocket WiFi rental — a small hotspot device (~¥800–1,200/day) that shares one connection across 5+ phones. Best for groups/families or phones that don't support eSIM. The catch: you must pick it up and RETURN it at an airport counter, and carry and charge it all trip.
3. Home-carrier roaming — usually the most expensive per GB. Worth it only for a very short trip, or pure laziness. Convenient, rarely cheap.
| Scenario | Travel eSIM | Pocket WiFi rental |
|---|---|---|
| Solo, 7 days | ~¥2,000 (1 eSIM) | ~¥7,000 (¥1,000/day) |
| Family of 4, 7 days | ~¥8,000 (4 eSIMs) | ~¥7,000 shared ≈ ¥1,750/person |
So a solo traveller with an eSIM phone pays far less with an eSIM — one device rental for a week costs more than one eSIM. But a family of 4 flips it: one pocket WiFi split four ways is cheaper per person than four separate eSIMs, and everyone stays on one connection.
Two things quietly break the plan. First, not every phone supports eSIM — older or region-locked handsets can't install one, which forces you onto a physical SIM or pocket WiFi. Check your phone's settings before the trip. Second, a pocket WiFi is a rental: you have to return it, usually to an airport counter by a deadline, or pay a penalty — and you carry and recharge it every day.
Smart middle path: solo and eSIM-capable → travel eSIM. Group or non-eSIM phone → one pocket WiFi, shared. Decide before you fly so you're not paying roaming rates while you queue at arrivals.
Solo with an eSIM phone → travel eSIM, every time. Group or family → one pocket WiFi splits cheaper per person. Roaming → only for a very short trip. The "right" answer isn't about the shiniest booth at the airport — it's about how many phones share the meter. First, confirm your phone supports eSIM.