Of course, the waterproof bag of mobile phone can send and receive wechat voice and even call.

Mobile phone data is transmitted through frequency, which is not affected by water; In addition, sound is transmitted through media, which can be solid, liquid and gas. Water belongs to liquid, so it is not difficult to send and receive sound.

What a crazy question Sound propagation depends on the vibration of the sound producing body and propagates through the medium.

Media include air, water and so on. You can't spread without media in outer space.

This is the principle of sound transmission. You just put your mobile phone in a sealed bag, not in a vacuum without medium. You can certainly hear wechat voice.