I would like to know how to deal with the sudden inability to access internet/make or receive calls on my smartphone
The issue may be resolved by checking and changing your smartphone settings.
Please refer to the following steps.
For iPhone
Mobile Data Settings
On the home screen, go to "Settings" [設定] → "Mobile Data" [モバイル通信] and make sure "Mobile data" [モバイルデータ通信] is turned on.
Please turn off "Mobile Data" [モバイルデータ通信] once, then turn it on again and check if you can use mobile data.
Wi-Fi Settings
On the home screen, go to "Settings" [設定] → "Wi-Fi" → If "Wi-Fi" is on, turn it off and check if you can use mobile data.
Airplane Mode Settings
On the home screen, go to "Settings" [設定] → "Airplane Mode" [機内モード] and make sure that it is turned off.
Please try turning on "Airplane Mode" [機内モード] once, and then turning it off again, check if you can use mobile data and make or receive calls.
Restarting the Device
There may be a temporary malfunction, so please turn off the power and then turn it back on (restart).
After that, please check if you can use mobile data and make or receive calls.
Updating iOS
If there is a problem with the iOS software, updating it may allow you to connect to Wi-Fi.
If there is a newer version of iOS released, try updating the software.
Reset Network Settings
If you are still unable to connect to Wi-Fi even after restarting your iPhone and router, resetting your iPhone's network settings may solve the problem.
- Please note that resetting network settings will also reset Wi-Fi passwords, mobile data settings, and Bluetooth® pairings.
For Android
Mobile Data Settings
On the home screen, go to "Settings" [設定] → "Network & Internet" [ネットワークとインターネット] → "Mobile Network" [モバイルネットワーク] and make sure "Mobile Data" [モバイルデータ] is turned on.
Try switching off "Mobile Data" [モバイルデータ], then turning it back on again, and check if you can use mobile data.
Wi-Fi Settings
On the home screen, go to "Network & Internet" [ネットワークとインターネット] → "Internet" [インターネット] → Wi-Fi. If Wi-Fi is turned on, turn it off, and check if you can use mobile data.
Airplane Mode Settings
On the Home screen, go to "Settings" [設定] → "Network & Internet" [ネットワークとインターネット] and make sure that "Airplane Mode" [機内モード] is turned off.
Try turning on Airplane Mode once, then turn it off again, and check if you can use mobile data and make or receive calls.
Restarting the Device
There may be a temporary malfunction, so please turn off the power and then turn it back on (restart).
After that, please check if you can use mobile data and make or receive calls.
Troubleshooting
Please check the Troubleshooting.
- If you cannot make or receive calls: On the Troubleshooting page, select "Android smartphone / Tablet" [Androidスマートフォン／タブレット] → "Voice / Calls" [音声・通話] → "Cannot Make/Receive Calls" [通話ができない] → Select the applicable state and check how to deal with it.
- If you cannot connect to the internet: On the Troubleshooting page, select "Android smartphone / Tablet" [Androidスマートフォン／タブレット] → "Network" [通信] → "No internet connection" [ネットがつながらない] → Select the applicable condition and check how to deal with it.
For your reference
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You can check the latest information on ongoing outages and maintenance on the following page.
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If you would like to know the causes of poor signal reception or slow data speeds in specific locations or environments, and what au is doing to improve them, please check the following:
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For signal issues at your home, workplace, or a commercial facility, please contact Denpa Support 24.
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