Watch And Listen To Large iTunes Podcasts Over 3G (or EDGE)
You’ve been able to directly download podcasts on your iPhone for quite some time now, but to download anything over 10MB requires that you be connected to WiFi. However, it’s incredibly easy to get around this arbitrary limit. Instead of tapping the “download” button on a podcast, simply tap the episode. Your iPhone will begin playing it right away, completely ignoring the limit. If you’re streaming audio, you can continue listening even if you exit the iTunes app.