eSIM vs Pocket WiFi vs Local SIM (2026): The Real Numbers for a Family of Four
Four phones, one budget, and a day when everyone splits up. We costed the same seven-day Japan trip three ways with dated prices, real carrier names and what each speed actually allows.
Quick answer: Written for a family of four on a seven-day trip to Japan. Costed on 23 September 2026: four Japan eSIMs at 5 GB each were US$40.48 total, on KDDI or SoftBank 4G and 5G, depending on the plan. One unlimited pocket WiFi from Sakura Mobile was 9,900 yen for 7 days, about US$63, plus 110 yen a day insurance. Four local 3 GB per day SIMs at the 7-day price of 4,950 yen each came to about US$126 and need a passport each. The eSIMs win unless the family never splits up.
Key takeaways
- One trip, three quotes, same week. Four eSIMs at 5 GB each: US$40.48. One pocket WiFi: about US$63, or about US$68 with the insurance. Four local SIMs: about US$126. All prices as published on 23 September 2026, converted at 157.18 yen to the US dollar (ECB reference rate, 22 September 2026).
- Pocket WiFi is one device, so it is one group. The moment two people walk in different directions, one of them is offline. That is the decision, not the price.
- Speeds are not the same thing. The Fizen Japan fixed plans run on KDDI or SoftBank 4G and 5G, depending on the plan and stay connected at 384 kbps after the bucket. Sakura Mobile's pocket WiFi runs on docomo with 10 GB of high-speed data a day. Sakura's 3 GB per day SIM plans drop to 1 Mbps once the daily 3 GB is used.
- 384 kbps still loads a map and carries an audio call. Zoom lists audio VoIP at 60 to 80 kbps and screen sharing without video at 50 to 75 kbps. What 384 kbps will not do is video.
Two parents, two teenagers, seven days in Japan, four phones and a shared budget. On paper this is the classic pocket WiFi case: one rental, everyone shares, done. Then the actual trip happens. One parent takes a kid to Akihabara, the other goes to Kamakura, and whoever is not carrying the little white box is standing on a platform with no map, no messages and no way to say which exit.
What does each option cost for four people for a week?
| Option for a family of four, 7 days | What you buy | Total | Per person per day | Network |
|---|---|---|---|---|
| Four eSIMs, 5 GB each | 4 x Japan 5 GB, 7 days, US$10.12 each | US$40.48 | US$1.45 | KDDI, 4G and 5G |
| Four eSIMs, 10 GB each | 4 x Japan 10 GB, 7 days, US$17.18 each | US$68.72 | US$2.45 | KDDI, 4G and 5G |
| One pocket WiFi, unlimited | Sakura Mobile 7 days, 9,900 yen | About US$62.98 | US$2.25 for the group | NTT docomo |
| One pocket WiFi plus insurance | 9,900 yen plus 110 yen a day | About US$67.88 | US$2.42 for the group | NTT docomo |
| Four local SIMs, 3 GB a day | 4 x Sakura Mobile 3 GB per day SIM, 7 days, 4,950 yen each including tax | About US$125.97 | US$4.50 | NTT docomo |
| Four eSIMs, unlimited | 4 x Japan unlimited, 7 days, US$27.50 each | US$110.00 | US$3.93 | KDDI, up to 10 Mbps |
When does a local SIM still win?
| Local option, priced for 4 to 10 October 2026, read 23 September 2026 | Price | Data | Catch |
|---|---|---|---|
| Sakura Mobile 3 GB per day SIM, 7 days | 4,950 yen including tax, about US$31.49 | 3 GB a day, then 1 Mbps | Per person, so four of them is four times the price |
| Sakura Mobile 3 GB per day eSIM, 7 days | 4,620 yen including tax, about US$29.39 | 3 GB a day, then 1 Mbps | No plastic to collect, and the passport check still applies |
| Sakura Mobile unlimited SIM, 7 days | 6,380 yen including tax, about US$40.59 | Unlimited on au, hotspot up to 6 GB | One person, one device |
| Sakura Mobile unlimited eSIM, 7 days | 5,775 yen including tax, about US$36.74 | Unlimited on au, hotspot up to 6 GB | One person, one device |
How much data does a family of four really use in Japan?
Converting published bandwidth figures at one Mbps for one hour being about 0.45 GB, and using Netflix's own per-hour numbers for video.
| What one person does | Data | Where it comes from |
|---|---|---|
| Transit app and maps, checked all day | 150 to 300 MB a day | Small lookups that add up on a train-heavy trip |
| Messaging and sending photos to the group | 250 to 400 MB a day | The photos, not the messages |
| Camera translation for menus and signs | 50 to 150 MB a day | Image translation costs more than typing |
| One hour of video at standard quality | Up to 1 GB | Netflix: medium 0.7 GB, standard definition up to 1 GB per hour |
| One hour of high definition video | Up to 3 GB | Netflix high definition, per hour, per device |
| One 30-minute 720p video call home | About 0.55 GB | Zoom lists 1.2 Mbps for one-to-one 720p |
What happens when the data runs out, on each option?
This is where the three products stop looking alike.
| Option | After the high-speed data | What that speed still does |
|---|---|---|
| Fizen Japan fixed plans | 384 kbps | Maps, messaging, audio calls, mobile web. No video. |
| Fizen South-Eastern Asia regional plan | 128 kbps | Text and map tiles, slowly. Audio calls are marginal. |
| Fizen Japan unlimited | Up to 10 Mbps, no bucket | One person on a 1080p call comfortably. A whole family sharing it, less so. |
| Sakura Mobile pocket WiFi | 10 GB a day at high speed, then reduced | Designed for a group, which is what the daily allowance is for. |
| Sakura Mobile 3 GB per day SIM | 1 Mbps | Standard definition video just about holds. Better than any of the throttles above. |
Which one should each kind of traveller buy?
| If you are | Buy | Because |
|---|---|---|
| A family of four, 7 days, splitting up some days | Four eSIMs, 5 GB each, US$40.48 on 23 Sep 2026 | The smallest total of the six rows above, and everyone is independently online |
| A family of four who never split up and watch video | One unlimited pocket WiFi, about US$68 for 7 days with the insurance | Unlimited beats four buckets, and one device is genuinely enough if you stay together |
| A solo traveller on a week's trip | One eSIM, 5 GB or 10 GB | A rental device for one person is a charger and a return errand for nothing |
| Someone whose phone has no eSIM or is carrier locked | Pocket WiFi, or a local SIM | No EID means no eSIM, whatever the model name says |
| A remote worker tethering a laptop daily | Unlimited eSIM, or pocket WiFi if the laptop must be online all day | Tethering drains the phone and a 10 Mbps ceiling is shared |
| A student or long stay, a month or more | A local SIM or local eSIM | Local plans are priced by the month rather than the week, and you have time for the passport check |
| A multi-country trip across Asia | One regional eSIM | One line across 18 countries beats buying at every border, at US$23.52 for 10 GB over 7 days |
Terms and conditions
- Information only. Fizen publishes this article to inform, not to sell. Nothing here is an offer, solicitation or sale of any product or service, and it is not financial, investment, legal or tax advice.
- For readers in the United States. This article provides information only. It is not an offer, solicitation or sale of any product or service, and it is not financial, investment, legal or tax advice. Fizen is not offered to US Persons.
- Not affiliated. Fizen is not affiliated with, endorsed by or a partner of Sakura Mobile, Japan Wireless, NINJA WiFi, Nippon SIM, NTT docomo, KDDI, Netflix, Zoom, Google or any other third party named here.
- Prices and rules change. Plan prices are those shown in the Fizen catalogue on 23 September 2026 and change without notice. Japanese rental, SIM and eSIM prices are those Sakura Mobile published on 23 September 2026 for a 4 to 10 October 2026 usage window, and its prices vary with the dates you pick. Yen amounts are converted at 157.18 yen to the US dollar, the European Central Bank reference rate for 22 September 2026, and the rate moves daily.
- Data figures are estimates. Per-hour data figures come from the providers named and describe typical use. Your own usage depends on video quality, background sync and how many devices share the connection.
- Data only. A travel eSIM provides mobile data. It does not give you a local phone number, voice calls or SMS. Keep your home SIM active for bank codes. Your phone must support eSIM and must not be locked to a carrier, and an eSIM works on one device only.
- Full terms. Master Terms of Use, Privacy Policy and Disclaimer on the Fizen site.
Sources
- Sakura Mobile: travel pocket WiFi and SIM prices
- Sakura Mobile: pocket WiFi guide (device, battery, return process)
- Sakura Mobile: best travel SIM cards for Japan (prices and ID rules)
- Japan Wireless: pocket WiFi cost in Japan, 2026 pricing guide
- Showcase-TV: the 2026 amendment to Japan's Act on Prevention of Improper Use of Mobile Phones
- Zoom Support: system requirements and bandwidth
- Google Workspace Admin Help: prepare your network for Meet meetings
- Netflix Help Center: how to control how much data Netflix uses
Updated 23 September 2026.
City guides: Tokyo eSIM guide.
