How to fix Galaxy S9 Plus won’t receive calls issue

Install updates
Some network errors are only corrected by updates. As errors become known, operators or developers can launch patches to correct them. If you have been keeping the updates disabled for any reason, be sure to try to install them as soon as possible. This is true both for your applications and for the Android operating system. Sometimes, the firmware of a device's modem (baseband) can also be updated, but these changes are usually included in regular Android updates. This is a key reason why you want to keep the system running the latest version available at all times.
this is samsung galaxy s9 plus dial

Replace the SIM card
Temporarily disconnecting the SIM card can sometimes help solve network problems. If you have not tried it yet, be sure to do it at this time. To avoid damaging network data, make sure your phone is OFF before removing the SIM. The same should be true when I insert it.
Restart network configuration
This is a basic troubleshooting step for any network problem. Be sure to do this before contacting your operator. This step will do the following:
Stored Wi-Fi networks will be deleted.
Paired Bluetooth devices will be deleted.
The background data synchronization settings will be activated.
The restrictive configuration of data in the applications that the client manually activated /
deactivated will be restored to the default configuration.

The network choice mode are going to be set to automatic.

Here are the steps to reset your network configuration:

From the home screen, slide up in an empty space to open the application tray.

Touch Settings> General administration> Reset> Reset network settings.


If you have set a PIN, enter it.

Touch RESET SETTINGS. Once completed, a confirmation window will appear.

Reset application preferences

Resetting the application preferences is often overlooked in many Android troubleshooting articles,
but when it comes to a problem like yours, it can be a big help. It is possible that one or some of your default applications are not configured correctly, causing this technical problem. Because there is no
way to know if this assumption is true, what you should do is simply make sure that all the default applications are activated. Here is how to do that:

Open the configuration application.

Touch Applications.

Click on More settings in the upper right corner (three point icon).

Select Reset application preferences.
Restart your S9 Plus and verify the problem.

Factory reset

In general, factory reset is a good general solution for minor software problems and, sometimes,
major ones. You want to delete your device with this solution if nothing has worked at this time.
This is how you do it:
Create a backup of your data.

Turn off the device.

Hold down the Volume Up key and the Bixby key, then press the power key and hold it down.

When the green Android logo appears, release all keys ("Install System Update" will be displayed for
about 30 to 60 seconds before displaying the Android system recovery menu options).

Press the key to lower the volume several times to highlight "erase data / restart factory".

Press the power button to select.

Press the key to lower the volume until "Yes: delete all user data" is highlighted.

Press the ability button to pick and begin the master reset.

When the master reset is complete, "Restart system now" are going to be highlighted.

Press the Power key to restart the device.

Talk to your network operator
In some cases, reporting a particular network problem to a network operator can help. The more customers report the same or similar problems, the more likely carriers will notice. While this is not the most straightforward way to solve this problem, you and other users may be doing well by telling your operator about this strange problem. Remember, you may not recognize it or even recognize the problem, but it's worth trying.

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