The purpose
When experiencing unstable internet connectivity on an Android device (child device) tethered to another Android device (parent device), let’s review the settings to check for potential issues.
Actual events
Network connectivity from client devices is unstable, frequently resulting in errors such as DNS connection failures. This seems to occur more often at the end of the month, although the reason is unclear.
Environment
Parent device
sim: docomo
Android: 10
Child device
sim: none
Android: 13
Confirmation settings
Change of priority network
Step
Open the “Settings” on the parent device.
Open ‘Network and Internet’.
open the mobile network (NTT DOCOMO).
”詳細設定”を開きます。
Open “Advanced Settings.”
Select “3G/GSM (Auto).”
With a new device, there’s also a 5G setting, so even ‘4G/3G/GSM (auto)’ might improve.
Limitation
This setting will slow down your network connection.
Result
Tethering connectivity has become significantly more stable than before the settings change.
Other
While the above settings will improve the situation, they are subject to certain constraints. If you encounter difficulties implementing these changes, you may wish to try the following alternatives. (Personally, I believe this is only a temporary fix and doesn’t address the root cause.)
Parent device
- Turn off tethering → ON
- Turn off mobile data → ON
- restart device
Child device
- Turn off Wifi → ON
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