If you are unable to establish a connection even after activating the Japan plan.

it may be necessary to manually enter APN settings for some Android devices.
Please check the following APN settings.
*Keep in mind that these settings may vary depending on your Android version or device model.

1. STEP 1

   Open the "Settings" app and search "Access Point Names".

   
2. STEP 2

   Choose "Access Point Names".

   
3. STEP 3

   Tap the "+" button at the top right corner.

   
4. STEP 4

   Edit the following six fields:

   - Name: Enter a custom name
   - APN: plus.4g
   - Username: plus
   - Password: 4g
   - APN type: default,ia,mms,supl,hipri
   - Authentication type: CHAP

   
5. STEP 5

   Press the "Save" button to save your setting.

   
6. STEP 6

   Check the connection using the APN you set.

   *When you are done using the eSIM, please revert the settings to the original.