I'm going to sign up my friends ex bf for sales calls
That's a little strange. Why are you going to do that?
He deserves it and I feel like doing something annoying to that person
You shouldn't do something like that. They will get a lot of calls and it will be your fault.
The ex bf will get angry thinking the new bf did it and I find that amusing.
I think it's a better move to just leave them alone, it's not kind to harass and potentially break up relationships by doxxing their number like this. How are they going to feel continually being bombarded like this? How about just telling them how you feel and then just stopping?