How to fix Galaxy J7 not recognizing SIM card issue

Solution: Under the SIM Card Manager section in Settings, there’s an option to allow you to activate Dual SIM functionality. This option is named Dual SIM always on. Make sure that it’s enabled. Here’s how

1 Open Settings app.

2 Tap Connections.

3 Tap SIM card manager.

4 Enable Dual SIM always on.

5 Reset app preferences

If there’s no change and the problem remains, the next step for you is to ensure that all default apps on the device are enabled. Some Android functionalities like Dual SIM needs some core system apps in order to work. If an important system app has been disabled by mistake, it may cause other apps or functionalities to fail. To reset app preferences:

1 Open Settings app.

2 Tap Apps.

3 Tap on additional settings at the higher right (three-dot icon).

4 Select Reset app preferences.

5 Restart your Galaxy J7 and check for the problem.

6 Reset network settings

Another good troubleshooting step that you can do in this situation is ensuring that the device has correct network configuration. To do that, you want to clear the current network setup. Here’s how:
From the house screen, swipe abreast of Associate in Nursing empty spot to open the Apps receptacle.
Click Setting  genreal management reset then click reset network settings.


2 If you've got got established a PIN, enter it.

3 Tap RESET SETTINGS. Once complete, a confirmation window will appear.

4 When it’s done, the following changes will occur by performing a reset of network settings.

Stored Wi-Fi networks will be deleted.
Paired Bluetooth devices will be deleted.
Background data sync settings will be turned on.
Data restrictive settings in applications that were manually turned on/off by the shopper ar reset to the default setting.
Network selection mode will be set to automatic.
Wipe the device (factory reset)
Lastly, you want to factory reset your J7. This can look drastic but it’s the only way for you to know if the problem is fixable on your level or not. Follow the steps below to wipe the phone:
Remove all Google accounts from the device
Create a backup of your data.

1 Turn off the device.

2 Press and hold the amount Up key and therefore the Bixby key, then press and hold the Power key.

3 When the inexperienced robot emblem displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
Press the amount down key many times to spotlight ‘wipe information / works reset’.

4 Press Power button to select.

5 Press the amount down key till ‘Yes — delete all user data’ is highlighted.

6 press power buttons to Select And Start The Master Reset
when The Master Reset Complete, Reboot System now Is Highlighted

7 Press the Power key to restart the device.

Get Samsung help
Should none of the solutions above help, there must be a coding issue or hardware fault behind the trouble. Visit your local Samsung Service Center for assistance.

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