I use Samsung A9 mobile phone, I haven t used wireless for a long time, it s been turned off, and to

If the Wi-Fi of the mobile phone cannot be turned on, the Samsung A9 mobile phone is generally recommended to perform the following operations:

1.Shutdown and restart attempts;

2.Check whether there is a new version of the system and try to upgrade the device version;

If the problem persists after the above operations, please bring the purchase invoice, repair card and machine to the service center for inspection.

If the wireless switch of Samsung mobile phone cannot be lit and turned on, it may be caused by system or hardware failure. Recommendations:

Back up your phone's data (**book, SMS, multi** files, etc.), and restore factory settings (go to Settings - Reset - Factory Reset).

If the wireless switch can be lit up, it is recommended to do the following:

1.Turn your phone and wireless devices on and off again.

2.It is recommended to forget the network to reconnect, operation: Settings - WLAN settings - click and hold the name of the network to be deleted - do not let go - forget to delete the network.

3.An attempt was made to replace the static IP address.

4.Whether it is too far away from the wireless router and affects the received signal.

5.If possible, this is the case with a change to another router or a wireless connection attempt.

6.Back up your phone's data (book, SMS, multiple files, etc.) and restore factory settings.

7.After updating the system version, test whether there is any improvement.

If the problem persists, it is recommended to take your phone to the nearest Samsung service center for testing.

Do the following: Brother Beat Excited.

1. Re-switch mobile phones and wireless devices;

2. Check whether it is too far away from the wireless router socks or interference;

3. If conditions permit, whether this phenomenon occurs when changing other routers or wireless connection attempts;

4. Back up mobile phone data, such as books, short messages, multiple files, etc., and restore factory settings to eliminate system and software problems.

If the problem persists, take your phone to the nearest Samsung service center for testing.

The wireless network of Samsung mobile phones often drops, it is recommended to do the following:

1.Turn your phone and wireless devices on and off again.

2.Check to see if it's too far away from your wireless router or if there's interference.

3.If possible, change to another router or try to connect wirelessly4Back up your phone's data (book, SMS, multiple files, etc.), restore factory settings to troubleshoot system and software failures.

If the problem persists, we recommend that you take your phone to the nearest Samsung service center for testing.

If your phone shows that you are connected to the wireless network, but you still can't access the Internet, we recommend that you:

1.Turn off your phone, restart your router, and reconnect to your wireless network.

2.Confirm the transmission bandwidth of the router (the supported router supports 40 MHz, we recommend setting it to 20 MHz) and check whether the router network is normal.

3.Confirm that IP address filtering is set up in the router MAC address filtering.

4.If you still can't access the Internet via Wi-Fi, we recommend that you try using a static IP address.

5.Connect to a different router attempt.

6.Try to restore the factory settings after backing up your phone's important data.

If the problem persists, it is recommended that you bring the purchase of the phone to the Samsung service center for testing.