The number game

I've been waking up the past few Sunday mornings with random texts from random numbers.... When going out I have a problem with being rude/mean to guys that ask for my number. I can't just make up numbers because then I actually have to think about it, and that would be too noticeable. I've been trying to figure out what the proper thing is to do when someone asks for your number. I'll just have to learn as I keep going out, I'll keep you all updated! If you have any helpful hints, PLEASE let me know!
xo
T