The phone does not charge when connected to a computer
The computer's USB port may not provide sufficient current.
If the phone is connected to a desktop computer, you are recommended to connect the data cable to a USB port on the back of the desktop unit.
If the phone is connected to a laptop, please connect the phone directly to one of the computer's USB ports; external USB ports may not provide sufficient current.
If the phone is still not charging, you are recommended to charge the phone via the mains using the battery charger.