① Enable “Data Saver Mode”

Instagram App → Profile →【Settings and privacy】→【Data usage and media quality】

📌 Turn on “Use Less Mobile Data”
📌 This reduces video preloading and the loading of high-quality photos/videos.

② Limit Media Quality and Preloading

Instagram App →【Settings and privacy】→【Media quality】

📌 Recommended settings:

✔ High-quality media → Set to “Wi-Fi only” or turn off
✔ Video preloading → Limit or turn off (if available on your device)

📌 Prevents large amounts of video content from loading automatically while scrolling.

③ Turn Off Background Mobile Data (iPhone)

【Settings】→【Cellular】→【Instagram】

📌 Turn off mobile data access or limit background activity.
📌 Prevents the app from continuously using data in the background.

④ Threads (Same Account System)

Threads uses the same Meta system settings as Instagram.

📌 Recommended settings:

✔ Enable “Use Less Mobile Data”
✔ Limit high-quality media
✔ Turn off background data usage

◆Stop videos from auto-playing in your Facebook news feed
https://www.facebook.com/help/1406493312950827/?helpref=uf_share

◆Adjust the number of photos you want to see to control the data usage and loading speed on Facebook.
https://www.facebook.com/help/mobile-basic/656932384361200/

＜Quoted from Facebook＞

◆ Enable “Data Saver” mode
Tap your profile picture in the YouTube app → Go to Settings → Video quality preferences → Under Mobile networks, select Data saver.

◆ Adjust “Video Quality Preferences”
Open the YouTube app → Tap your profile picture → Settings → Video quality preferences → For Mobile networks, choose Data saver (e.g., 480p or lower).

◆ Turn off “Autoplay next video”
Tap your profile picture → Settings → Playback → Toggle off Autoplay next video.
This prevents continuous playback in case you fall asleep or forget to stop the video.

◆ Limit video preloading while browsing your feed
Tap your profile picture → Settings → Playback → Set Play videos in feeds to Off or Wi-Fi only.

◆ Turn off mobile data usage for the YouTube app
For iPhone:
Go to Settings → Mobile Data → Find YouTube → Toggle off to disable mobile data usage.

For Android:
Go to Settings → Apps → YouTube → Mobile data & Wi-Fi → Turn off Allow background data usage.

◆ Turn off background app refresh using mobile data
Go to “Settings” → “General” → “Background App Refresh”
Since most apps don’t need real-time updates, it’s recommended to set this to “Wi-Fi” so mobile data isn’t used.

◆ Turn off “Wi-Fi Assist”
Go to “Settings” → “Cellular” → Turn off “Wi-Fi Assist.” When Wi-Fi connection is poor, the system won’t automatically use mobile data.

◆ Turn off mobile data for iCloud backup
Go to “Settings” → “Cellular” → “iCloud Backup,” and turn it off so mobile data won’t be used for automatic iCloud backups.

🅰️ Yes, you can.
We recommend completing the APN settings before departure, so you can use the Personal Hotspot function immediately after arriving in Japan.

⚠️ However, our SIM/eSIM products use Japanese local mobile networks and are not international roaming products. Therefore, they cannot connect to the Japanese Docomo network while you are outside Japan. Even if the APN settings have been completed, you will not be able to confirm whether the settings are successful or test the Personal Hotspot function overseas.

📌 In short:
✔ You can set up the APN before traveling.
✔ You can use it after arriving in Japan.
❌ You cannot test whether the APN settings are working while outside Japan.

This is a normal situation. Please test the connection after arriving in Japan and connecting to the mobile network.

🅰️ Please check the following items first:

① Confirm that the APN is set for the correct SIM/eSIM

If your phone uses multiple SIM cards or eSIMs at the same time, the most common issue is that the APN was set for the wrong SIM card.

Please confirm that the SIM/eSIM currently used for Mobile Data is the same SIM/eSIM where the APN settings were entered.

② Restart your device after completing the settings

After completing the APN settings, please restart your phone once and test the Personal Hotspot function again.

③ Recheck the APN information

Please carefully verify the following information:

✔ APN
✔ Username
✔ Password

Make sure all settings exactly match the information provided in the instruction manual.

⚠️ Important Notes

Due to the wide variety of smartphone brands, models, and operating system versions, the settings screens may differ depending on the device. Therefore, we cannot guarantee that the Personal Hotspot function will work on every device.

However, as of now, we have not received any cases where the Personal Hotspot function could not be used due to an issue with the JB SIM/eSIM itself.

🍎 iPhone (iOS)

📌 Turn on Personal Hotspot:
【Settings】 ➡ 【Personal Hotspot】 ➡ Turn on 【Allow Others to Join】
You can then share your mobile data connection with other devices.

📌 Change Wi-Fi Password:
【Settings】 ➡ 【Personal Hotspot】 ➡ 【Wi-Fi Password】
Enter a new password and save the settings.

📌 View or Change Wi-Fi Name:
【Settings】 ➡ 【General】 ➡ 【About】 ➡ 【Name】

This device name will be displayed as the Wi-Fi hotspot name when other devices search for available networks.

🤖 Android

※ The operation interface may vary depending on the brand and model. The following example uses Samsung A55.

📌 Turn on Personal Hotspot:
【Settings】 ➡ 【Connections】 ➡ 【Mobile Hotspot and Tethering】 ➡ Turn on 【Mobile Hotspot】

You can then share your mobile data connection with other devices.

📌 Change Wi-Fi Name or Password:
【Settings】 ➡ 【Connections】 ➡ 【Mobile Hotspot and Tethering】 ➡ 【Mobile Hotspot】

📌 Tap 【Network Name】 or 【Password】
to enter the settings page and modify the hotspot name and password.

🅰️ Once you arrive in Japan, you can use the following services:

📞 Voice calls
💬 SMS (Text Messages)
🌐 Mobile data (1–50GB)

All of the above services are available for normal use.

📶 How Do I Use Mobile Data?

Before using mobile data for the first time, you need to complete a simple setup.

🤖 Android

• Manually configure the APN settings.

🍎 iPhone

• Download and install the configuration profile.

Once the setup is complete, you can use mobile data in Japan. Voice calls and SMS will also work normally.

📖 For detailed setup instructions, please refer to the user guide included with your SIM card.