Device

• Why is the Send button grey and cannot be clicked after information editing is displayed on my mobile phone?
• My mobile phone cannot find a developer model. I cannot start the usb mode and cannot connect to the computer.
• Can I dial the VOLTE number?
• The wireless network speed is lower than the wired network speed.
• Whether the forced backup function can be used during system upgrade
• The system time is not accurate or slow.
• The system prompts that the third-party application to be installed is malicious software.
• After the preset alarm clock of the system arrives, no ring is played.