Hi. i have the blackberry curve and yesterday 3 people called me and they coudn't here me at all. it sounds like i am on mute but im not. my volume is on high and in not on mute or hold how can i fix this ?

Hi. i have the blackberry curve and yesterday 3 people called me and they coudn't here me at all. it sounds like i am on mute but im not. my volume is on high and in not on mute or hold how can i fix this ?
Usually the best thing to do is to just call the company and talk to a technician.