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What should i do,if the bluetooth cant open,?
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If you cannot connect a Bluetooth accessory to your phone or tablet, going through the connection process step-by-step will help get your wireless devices working together.

1Ensure your Bluetooth is enabled

It may sound simple but it is important that both your Galaxy phone and connecting device have Bluetooth turned on. If this setting is disabled on one device, then they will not be able to locate each other. For step-by-step instructions on enabling this settings check out our page How do I pair my Mobile device with a Bluetooth device?It is also important that you enable Phone Visibility on your Galaxy phone. To turn the setting on head into your Settings → Connections → toggle on Phone Visibility → Agree to the pop-up permissions.Ensure that the connecting device isn't already connected to another source (e.g. phone, TV, car)

2Forget paired devices

If the device is connected but your phone isn't able to communicate with the bluetooth device, it is recommended to unpair and repair the two. Head into your Settings > Connections > Bluetooth > Select cogwheel beside the connected device > tap Unpair.

3Reset Network Settings

If another Bluetooth device is not located or there are connection problems or performance malfunctions, try the following:

Ensure that the device you wish to connect with is ready to be scanned or connected to. Ensure that your device and the other Bluetooth device are within the maximum Bluetooth range (10 m).On your device, launch the Settings app, tap Connections, and then tap the Bluetooth switch to re-activate it.  On your device, launch the Settings app, tap General management → Reset → Reset network settings → Reset settings → Reset to reset network settings. 

Please Note: Resetting your Network Settings will reset all networks including previously save Wi-Fi, Mobile data and Bluetooth connections.

4Safe Mode

By putting your device in Safe Mode you will restrict third party applications forcing the device to only run on the essential operating system. Follow the below steps to Activate Safe Mode on your Samsung device;

Turn the device off by holding the Power button until the option to Power Off appears on the screen. Tap Power off .Press and Hold the Power and the Volume Down buttons at the same time, to turn the device on. 
When you see the Samsung logo appear on the screen, you can let go of the Power button while the device boots up. Make sure to keep holding the Volume Down button.

Once the mobile device is in safe mode, try reconnecting your phone via Bluetooth.