Sometimes I watch TV at home. I often watch News then I also watch a few commercials.

Such as food, asking a lawyer and furniture store, etc...

I always wondering that how do I know that phone number. Because that commercials shows phone number, but I can't read all number.

For example, here it is: 1 (800) 234 -ＢＥＳＴ.

How do they know that phone number?