How many phone number combinations are there in the U.S? Random Question! Ha.?

So I just randomly pondered this question, and I tried desperatly to figure out out, but I couldn't. So how many possible phone number combos are there?! I thought of it like.. 10 different possible numbers..including zero. 11 slots for the number including 1. 1 ### ### #### Now..you figure it out! lol,... show more So I just randomly pondered this question, and I tried desperatly to figure out out, but I couldn't. So how many possible phone number combos are there?!
I thought of it like.. 10 different possible numbers..including zero.
11 slots for the number including 1. 1 ### ### ####
Now..you figure it out! lol, i'm just curious! :D