If you’ve ever tried to download a podcast or a lot of applications, you know how frustrating that 10MB 3G cap can be on the iPhone. For those who don’t know, any time you try to download something larger than 10MB over a 3G connection, you get a message asking you to connect to a Wi-Fi network before you continue with the download. Along with the changes Apple made to iPhone policies this week, it also doubled the download cap, from 10MB to 20MB.

The change was most likely to accommodate the difference in file size between iPhone and iPad applications. It is nice, though, to be able to pick up some shorter podcasts and whatnot on the go, even if my This American Life downloads tend to be a bit bigger.

The change is effective immediately – I was able to pick up a 15MB app no problem this morning.