JLP TRAVEL JOURNAL · JAPAN
The right Japan eSIM does not have to be the largest plan. Choose according to your travel dates, data habits and the actual plan conditions. This guide compares 500MB, 2GB and 3GB per day, Total and Unlimited plans to help you decide.
Japan eSIM comparison: 500MB, 2GB, 3GB, Total and Unlimited
This table compares plan types. It is not a speed test or a ranking of stores. Check the product page for current options and prices.
| Type | Best suited to | What to watch for |
|---|---|---|
| 500MB / day | Light users who use maps, messaging and search, with Wi-Fi available. | Video, photo uploads and background apps can consume the allowance quickly. |
| 2GB / day | Travellers who use maps, social media and occasionally share photos. | Not guaranteed to cover long video sessions or extended hotspot sharing. |
| 3GB / day | Frequent social media users who upload photos or watch some video during the day. | High-resolution streaming and hotspot use still consume substantial data. |
| Total | Travellers who want to allocate a shared data allowance flexibly across the trip. | The allowance does not renew daily. Check the plan validity as well. |
| Unlimited (FUP) | Frequent users who accept reduced speeds after a usage threshold. | Check the high-speed allowance, throttled speed and reset schedule. |
How do daily and Total plans differ?
Daily plans A daily plan specifies an allowance such as 2GB/day. Check whether data stops or slows after the allowance is used, and when it resets. Do not assume every plan resets at midnight in Thailand.
Total Total means the allowance covers the entire plan validity. For example, 10GB Total valid for 7 days provides 10GB to share across those 7 days, not 10GB each day. Using 3GB on day one leaves 7GB for the rest. This explains the calculation and does not confirm that this option is always available for Japan.
If you use Wi-Fi most of the day and only need mobile data outdoors, Total may suit you. If your usage is consistent each day, a daily plan may be easier to manage.
How many GB do you need for 5 or 7 days in Japan?
Start with your phone's mobile data statistics and estimate the portion you will use through the travel eSIM. A simple formula is: Estimated daily usage × number of travel days Allow extra for days with heavier usage.
- 5 days at approximately 0.3GB/day: Estimated total: 1.5GB. Consider 500MB/day if you have Wi-Fi and use little video.
- 7 days at approximately 1.5GB/day: Estimated total: 10.5GB. A Total plan needs sufficient allowance and validity. With 2GB/day, you still need to manage each day's usage.
- Trips involving streaming or hotspot sharing: Check actual usage across all devices, plus hotspot and FUP conditions.
These figures are calculation examples, not user survey results or guarantees. Video quality, photo backups and background apps affect usage.
Include the return journey when counting usage days. Check whether validity is measured in 24-hour periods or calendar days and whether it starts at installation, activation or network connection under the product conditions.
Unlimited plans differ: read the FUP before buying
Unlimited (FUP) may allow continued access after a threshold, but at reduced speeds. Check whether the threshold is daily or for the full plan, the reduced speed and when the allowance resets. Do not choose on the word Unlimited alone.
Actual speed also depends on signal, location, device and network congestion. Constant maximum speed should not be expected.
5 things to check before buying a Japan eSIM
- Phone model and market of sale: Check that your exact model supports eSIM and is carrier-unlocked. The main model name alone is not enough.
- Duration and activation conditions: Distinguish the QR code's activation validity from the number of internet usage days.
- Supported networks: Check the networks listed on the product page and coverage along your route, including cities, mountains and rural areas. Do not assume one carrier is best everywhere.
- Hotspot access and restrictions: If you will connect a laptop or share with friends, confirm that the plan permits it and check any limits.
- eSIM delivery and after-sales support: Check your email address, keep your order number and read the refund conditions before paying.
Check coverage with NTT DOCOMO and au Coverage maps do not confirm that every eSIM plan can access every network.
Prepare your eSIM before travel and troubleshoot connection issues
Read the activation conditions before installation. Use a stable internet connection to receive and install the eSIM according to the guide. At your destination, select it for mobile data and configure Data Roaming as instructed by your plan.
If you keep your Thai SIM for SMS or OTP, check dual-SIM support, your home carrier's services and roaming charges first. A travel eSIM does not guarantee OTP reception or automatically waive charges on your Thai SIM.
If there is no signal, check that the eSIM line is enabled, selected for mobile data and configured as instructed. Do not delete the eSIM immediately: reinstallation may not be possible. Contact JLP support with your order number, phone model and screenshots with personal information hidden.
Read the eSIM installation guide for iPhone and Android → · Read the terms and refund policy →
Japan eSIM frequently asked questions
Is 500MB per day enough for Japan travel?
It may suit light users focused on maps and messaging with Wi-Fi available, but not heavy video or uploads. If you regularly exceed 500MB, consider a larger plan.
Is 2GB/day for 7 days the same as 14GB Total?
The mathematical total may match, but allocation differs. Daily plans have daily limits; Total plans draw from a shared allowance. Check what happens when data runs out and when each plan expires.
Does Unlimited mean speeds never slow down?
No. Unlimited (FUP) can reduce speeds at a defined threshold. Read the high-speed allowance, reduced speed and reset schedule before buying. Actual speeds also depend on the network and location.
Should I install before flying or after reaching Japan?
It depends on the product's activation rules and QR validity. Ask before installing if uncertain. Do not assume every plan starts only after arrival.
Can I still receive OTP on my Thai SIM while using an eSIM?
It depends on your phone, dual-line settings, Thai carrier services and roaming. Check with your home carrier before travelling, especially charges and overseas SMS reception.