日本 SIM vs ポケットWiFi 2026|本当にどっちが良い？

Japan is the last major country where 'do I get pocket WiFi or a SIM?' is still a real question. After testing all 3 across a year of travel, here's the honest verdict.

The 3 options compared

eSIM: the 2026 winner for solo travelers

eSIM is the clear winner for anyone with an iPhone XR+ or Pixel 3+. Buy before arriving via Ubigi app ($15/10GB, $22/20GB). Install in 5 minutes. Auto-activates on landing. No physical SIM swap. Zero airport time.

• ●Ubigi (recommended) — $15/10GB, $22/20GB, 30-day validity
• ●Airalo — similar pricing, sometimes cheaper deals
• ●Nomad — 5G support, slightly pricier
• ●Best for: solo travelers, tech-comfortable
• ●Not for: older Android phones (SIM lock check needed)

Physical SIM: for older phones

• ●Sakura Mobile — 5GB/16 days ¥3,300, English support
• ●Mobal — unlimited data ¥5,900/16 days
• ●Where to buy: Bic Camera, Yodobashi, airport SIM counters
• ●Best for: phones without eSIM, unlocked older Androids

Pocket WiFi: for families + groups

Pocket WiFi is a small device (150g) that broadcasts WiFi to up to 10 devices. If traveling with a family of 4-5 or laptops, this is cheaper than 4-5 individual SIMs. Rent at airport counter or via Klook for delivery.

• ●Ninja WiFi — most popular, ¥900/day = ¥12,600/14 days
• ●Sky Gate WiFi — cheaper, ¥750/day
• ●Rakuten Wifi — Klook has promo pricing
• ●Best for: families of 3+, digital nomads with laptops
• ●Drawback: extra device to charge + carry

Coverage — all options are basically identical

In 2026, all 3 use Japan's major carriers (Docomo, Softbank, or KDDI). Coverage is 99.5% of populated areas including remote mountains. Only genuinely rural onsen or ski resorts have dead zones (and hotels there have WiFi).

Data speed reality check

• ●Google Maps + walking navigation: ~100MB/day
• ●Instagram scrolling: ~500MB/day
• ●Video calls / YouTube: 1-2GB/day
• ●14-day trip typical: 5-15GB total
• ●Recommend: 10GB is enough for most 2-week trips

Verdict by traveler type