Device

• Can the label on the back cover of the mobile phone be torn off?
• Phone keys shaking
• The handset key feels hard.
• Installing the Upgrade Package on a Mobile Phone
• The mobile phone is not powered on after being installed with the upgrade package.
• WLAN on the mobile phone cannot be disabled (the WLAN switch is dimmed).
• WLAN on the mobile phone cannot be disabled (the WLAN switch is dimmed).
• Poor call effect of the mobile phone VOLTE