Give them easier access and they will upload and watch. Google (NSDQ: GOOG) said today that since the iPhone 3G S has come out, YouTube uploads have risen 400 percent. That’s a mighty jump being attributed to one phone model. But Google, which owns the online video site, said that in the last six months, uploads from all mobile phones to YouTube have surged 1,700 percent.

The company attributes the overall growth to new video-enabled phones on the market, as well as improvements it made to make it easier to post a video to YouTube from a phone, plus a recently added feature that lets users connect their YouTube account to their social networks. We’d also add the increase in cheaper flat rate data plans to the list.