LG PM-325

ive had this phone for alogn time and have never encountered this. I woke up this morning and looked at my phone and in the banner spot, or where it says vibrate if you phone is on vibrate are the words -Car Kit- now those where never there before. As of today when someone calls me my phone will not ring or vibrate, it shows that someone is calling me but when i answer im told the person calling me heres a loud noise. I can not talk or hear the person calling after i answer nor can the caller, please help because my phone is now virtually useless.