A 1-800 number is immune to long distance charges, free to call by anyone in the US— the owner of the 800 number pays any fees associated with the call. Traditionally, 800 numbers are owned by companies in order to sell stuff. (The 1- portion of a 1-800 number means that it’s a long distance call… which was a thing when I was growing up in the 80s/90s, but basically isn’t a thing anymore in the age of cellphones)
The opposite of an 800 number is a 900 number. The person calling a 900 number has to pay, usually by minute, and most of that money goes to the owner of the 900 number. Famously used for phone sex lines.
It affects the election, but not in the way you want. It is literally the equivalent of not voting at all. That does effect the outcome if you would have voted for one of the two main parties otherwise.