Using my phones (android and iphone) i am never able to reply to ANY craigslist ads. After doing the hCaptcha security check successfully it displays an error ID message with a series of numbers. When on wifi i can reply just fine. Its only with AT&T data that this problem occurs on my phones, doesn't matter which app i use. T-Mobile seems to work just fine, and possibly other carriers. Not sure why AT&T doesn't. Any ideas/suggestions?