Size of picture

I have noticed that some commercials are larger than my screen, much like wide screen movies that are not shown in letter box. I don't know if this happens with any other stuff because I don't know what is supposed to be on the edges but with commercials, telephone numbers and other info that is on the edges is cut off. I have contacted the TV stations about this and they tell me that they are not having that problem so it must be something Verizon is doing, almost like putting a camera to close to a picture.