Why do domestic mobile phones pop up Korean SMS reminders?

First, let's see if the ringtone you set is the mode you are currently using. If not, then don't go. Second, if there is no sound, you may have installed some software to block it. I suggest you take off the memory card machine and try to restore the factory settings. Third, if it still doesn't work, you can conclude that there is something wrong with the mobile phone. Go to KF and let others show you whether to repair or change the national customer service telephone number: 4008800 123, and there is no long-distance charge.