No, the eSIM itself does not drain the battery of your mobile device. It consumes the same as a SIM card when using cellular data. However, being connected to two networks uses more energy than being connected to one network. The same goes for using your eSIM (or SIM) for sharing personal Hotspot, this would naturally drain your battery.
Explore Ubigi eSIM data plans for seamless connectivity worldwide!
Install once, stay globally connected for life with a single eSIM, compatible with all eSIM-enabled devices : iOS Phone, iPad OS, Android, and Windows 10 and 11.
Are you a company with teams on the move?
Manage your employees' LTE/5G connectivity on smartphones, tablets, laptops, and hotspots while maintaining complete control over your costs.
Explore Ubigi eSIM data plans for seamless connectivity worldwide!
Install once, stay globally connected for life with a single eSIM, compatible with all eSIM-enabled devices : iOS Phone, iPad OS, Android, and Windows 10 and 11.
Are you a company with teams on the move?
Manage your employees' LTE/5G connectivity on smartphones, tablets, laptops, and hotspots while maintaining complete control over your costs.
Great
Based on 28535 reviews on
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Reliable Connection
Reliable Connection
MB, 14 Nov 2025
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Central Japan 2025
Great service even in remote countryside areas of central Japan and in the mountains. Highly recommend
Melissa O., 14 Nov 2025
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Signal is good
Signal is good
customer, 14 Nov 2025
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eSIM experience with Ubigi is great
The price is competitive with other data plans available for Japan, and the eSIM can be purchased in advance. After purchase I received clear instructions on how and when to activate the eSIM, and when to switch it on.
The coverage in Japan is very good. Unlike other eSIMs, it did NOT stop working after 3 days, and you can clearly see the data balance and validity if you install the Ubigi app.
CE, 14 Nov 2025
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Traveling from UK to Japan with Ubigi
As soon as I landed in Japan Ubigi was up and running and I didn’t have to worry about using my phone abroad. Thank you so much for the peace of mind this gave me.
Nicholas Minns, 14 Nov 2025
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Data at your fingertips with no issues
Data at your fingertips with no issues
Helen, 14 Nov 2025
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Works well
Works well. Good coverage and speed
customer, 14 Nov 2025
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Easy to use
It’s really easy to use and not expensive. The only problem is I sometime experienced short connectivity issues in big cities in Japon. Maybe that could be improved
Mélanie, 14 Nov 2025
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Good signal and easy
Good signal and easy
customer, 14 Nov 2025
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Ubigi works!
We bought Ubigi for the first time for our Japan trip; I have to be honest, i was impressed it worked all the time! We were very happy with the service, never had issues on the subway, Shinkansen or even on the mountain of Kyoto of the monkey park! It would get signal everywhere!! The only time it slowed down was in the basement floor 2 while I was in the bathroom, but no issues anywhere else!
customer, 14 Nov 2025
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Ubigi surpassed my expectations
Ubigi surpassed my expectations. I used it in Japan and South Korea and the signal was great. I had high speed internet the whole time.
It was my first time using it, and what I enjoyed the most about Ubigi is that I didn't need to install a new eSIM when I got to a different country. I kept the same eSIM, and I just change the plan on the Ubigi App. I feel this is such a great feature that is not advertised enough.
Erik, 14 Nov 2025
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good connection but bad compatibility test
good connection. however it said my iphone is sim-locked after arrival although i did the compatibility test successfully from my home country. turns out i had to take out the sim card from my home country.
customer, 14 Nov 2025
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Very easy to use
Very easy to use
Monica, 14 Nov 2025
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Easy to use
Easy to use, great price and very reliable.
Karen, 14 Nov 2025
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Very good service
Very good service
customer, 14 Nov 2025
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How to check if a device is ready for eSIM?
Check eSIM compatibility
Smartphones & Cellular Tablets:
Dial (*#06#). If an EID number shows, your device supports eSIM!
Laptops (Windows 10/11):
Open your flyout (bottom-right corner). If Cellular settings are visible, your laptop supports eSIM!
Check Carrier Unlock
On iOS:
Go to Settings > General > About, scroll to Carrier Lock. If it says "No SIM restrictions", your device is unlocked!
On Android:
Go to Settings > Network & Internet > Mobile Network, turn off Auto network selection. If you see multiple available networks, your device is unlocked! If only one appears, or you get an error, it may be locked.
You already have an eSIM in your cart.
Each order can only include one eSIM data plan.
Current plan: •
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Check eSIM compatibility
Check Carrier Unlock