Something wrong with cell phone

This cell phone belongs to my dear and he not used it for such long time and I used it. Guess what so many problems with this phone people calling me and cannot listen at all. Then half way sms the cell phone will hang and shut down itself. I change back to my current cell phone that also something wrong. I need to find a day take the cell phone for repair and depend what wrong with phone usually cost me USD$20 repair.