Polling and cellphones

Is it possible that pollsters disproportionally miss college students? This is idle speculation by someone who knows nothing about the polling process. But if pollsters are anything like telemarketers, they will target people with landlines, for reasons of either cost or legality. And most voters under 30 probably do not have landlines (OK, no doubt there is a sizeable group that has returned to their parents for rent-free mooching...). Obviously the major limitation of polls is the volatility of this race. But are cellphones a factor? Anyone?