No, I don't give my phone number either. Not even when I'm going to meet someone. Done that once and then the guy kept texting till he finally understood that I wasn't interested. But he sent me another text, some 3, 4 months after we'd had the one date, to say he had dreamed about me. He sent that in the middle of the friggin night?!
I haven't got a landline, just a cell phone, so no area codes or anything. But I don't want to get phoned, texted or Whatsapped by ppl I barely know or don't want to be in touch with (anymore).