Why did someone send me a message while playing the game? I don't know, and my mobile phone didn't prompt me.

Maybe the phone only has game mode. When the phone enters or opens the game, it will automatically enter the game mode. The game mode will turn on the mobile phone vibration, ringtone and mobile phone accidental touch mode, and the incoming SMS will be scaled in the background without reminding the user of the message content, so that the received information can be seen after the game is over. You can turn on the settings of your mobile phone, find the game assistant or game mode, turn off this switch, exit the game mode, and then enter the game again. It will be timely when there is a new message or call.