Check Mute key
1. The left side of the Apple phone has a mute button, we can move up and down to realize the sound switch function, we see is not here closed.
Restart your phone
1. On the top of the iphone we long press the "power button" on the screen to turn off the key.
2. Then please slide the slider off, and then press the power button to boot.
Restore factory Settings
1. On the Apple phone "settings"-"General"-"restore"-"Restore all settings" and then start to restore.
6. Restoring all settings only restores the system settings on the phone, and this restore does not affect the data on the phone, such as photos, videos, music, etc.
There's a voice on the phone, a third party application, no sound .
1. Is that we put the sound of the software to the latest, this we just tune the sound button is useless, like I use PPS to turn off the sound of the other third-party software is no sound, but the phone does not sound, we just open a third party software, and then open on the can.
Upgrade or restore the iphone firmware system
Let's go directly to the Apple phone, specifically in: Settings-general--> software Update, and then there will be the relevant prompts, we just click on the update (note the use of WiFi network)