Early mobile phones were big and cumbersome and required large, heavy batteries that gave only a short usage time between charges. Technological advances have delivered miniature, power-efficient electronic components and small, high-performance rechargeable batteries. Manufacturers now produce highly sophisticated multifunctional phones that have the same processing power as a PC from the 1990s but consume only 1 per cent of the energy. One factor remains unchanged; without regular charging, a mobile phone soon becomes no more useful than a paperweight.
Turn on the PC. Wait until it has booted fully.
Check that you have the correct USB charging cable for your mobile phone. Connect the large USB plug on the cable to a spare USB port on the PC.
Connect the small plug on the other end of the cable to the USB socket on your mobile. Some phones have a small protective cover over the USB socket that you will need to remove.
Check the display on the mobile to ensure that it is charging. If there is no charging indication, switch on the phone. Some models will only display the charging status when the phone is powered. Wait until the display indicates that the phone battery is fully charged.
You can use a laptop computer running on battery power to charge your phone if you do not have AC mains available.
Do not try to use a charging cable that is not suitable for your mobile. You may damage the USB socket on your phone or overload the electronic circuitry inside it.