The phone rings, however I cannot hear the caller

A sound settings have been reduced on the phone or possibly disabled from producing any at all. The sound could be re-enabled by locating on the phone the settings icon and navigating with the arrow keys until the sould iocns could be re-adjsuted. Once at the ssound icon on the phone, useing the option buttons to select sound instead could be customised by increasing volume scroll bar up and down to until found suitable ring tone.