Those who depend on Google Docs know how frustrating it is when you want to make a simple change from an iPhone, but can't because Google Docs is read-only on mobile devices. Until now, that is. Google has just introduced a new mobile editor that makes it possible to make changes to your Google Docs from any iOS 3.x or later device, as well as from Android devices running Froyo (2.2).

The mobile version of Google Docs has been around for three years now. Though Google has increasingly added support for more mobile browsers over that time, the inability to actually edit documents has been irritating for users. For example, I like to track my workout progress in a Google Doc, which would be even easier if I could save changes from my iPhone while I am at the gym and the numbers are still fresh in my head.

The changes are rolling out over the "next few days," according to the Google Docs team, but you'll know they're live when you see the "Edit" button at the top of your documents. From the looks of it, the interface is as usable as you could expect from such a small screen space, and Google says it's working to introduce support for non-English languages in the near future.

For those who don't have the new mobile editor yet but want to see how it works, Google has published a video demonstrating the UI: