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How to set the whistle for Samsung j7?

Samsung J7 mobile phone change notification ringtone is as follows:

1. Open Settings-(Device)-Sound-Ringtone-Default Notification-Select Ringtone. If you are prompted to choose the open mode, it means that your mobile phone has installed a third-party ringtone download software, and you can also choose the ringtone downloaded by this software as the notification ringtone.

2. If the mobile phone changes the ringtone to display blank content, it is recommended to open the mobile phone settings-(General)-Application Manager-Menu button-Reset application preferences and try again.