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Solved Android 10 Tethering Issue

Tadashi Shigeoka ·  Sat, February 15, 2020

I solved the issue where tethering stopped working after updating to Android 10, so I’ll share the solution.

Android

Prerequisites

Android OS: 10 / Device: OnePlus 6T

  • Android device: OnePlus 6T
  • OS: Android 10

SIM is BIC SIM

The SIM card I’m using is BIC SIM.

💡 テザリングは可能ですか? | IIJmio

The official website states that tethering is possible, so there should be no contractual issues.

Solution for Android Tethering Issue

Configuration Steps to Solve Tethering Issue (IIJmio Edition)

Here are the configuration steps that solved the Android 10 tethering issue:

This has been tested only with BIC SIM (IIJmio). I don’t know if this configuration is effective with other carriers’ SIMs.

Configuration Steps

  1. Open [Settings] app
  2. [Wi-Fi & Internet] - [SIM & network] - [SIM settings]
  3. Select either [SIM 1] or [SIM 2] that you want to use for tethering
  4. [Access Point Names] - [APN] - [IIJmio (LTE端末)]
  5. Change to the following settings in [Edit access point]
  6. [Save]
APN type
ia,default,supl

MVNO type
GID

MVNO value (default value set after selecting GID)
FFFFFF

Confirming Connection Destination from PC During Tethering

IIJmio

すでに書いちゃっていますがIIJmioの運営会社であるIIJはMVNEでもあります。

スマホに設定したAPNはiijmio.jp、しかし実際のIPのホスト名を見るとvmobile.jpとある。

JPRSでvmobile.jpを確認した結果が下のスクショ。IIJmioのSIM利用時に取得するIPアドレスは株式会社インターネットイニシアティブ（IIJ）のサーバーです。

ドメイン名の前にあるサブドメイン「rev」は今回気にしないようにします。地域だったり時期だったりとMVNEの都合でドメインを別けているのでこうなっています。

引用元: APNではなく実際のIPアドレスからMVNOのMVNEを探ってみた - シムモビ

English translation:

IIJmio

I’ve already mentioned this, but IIJ, the operating company of IIJmio, is also an MVNE.

The APN set on the smartphone is iijmio.jp, but when you look at the actual IP hostname, it says vmobile.jp.

The screenshot below shows the result of checking vmobile.jp with JPRS. The IP address obtained when using IIJmio SIM is from Internet Initiative Inc. (IIJ) servers.

We won’t worry about the subdomain “rev” before the domain name this time. This is because domains are separated for MVNE convenience by region, time period, etc.

Source: Investigating MVNO’s MVNE from Actual IP Addresses Rather Than APN - SimMobi

Collection of Error Cases in Tethering Settings

The mobile carrier does not allow adding APN of type dun.

I often see articles saying “add dun to APN type in APN settings”, but in my case, changing from

default,supl

to

default,supl,dun

resulted in an error dialog stating “The mobile carrier does not allow adding APN of type dun.” and I couldn’t save the APN settings.

That’s all about solving the Android 10 tethering issue from the Gemba.

Reference Information

That’s all from the Gemba.