It was almost a footnote in Microsoft's big reveal of Office for iPad today, but the iPhone and Android version of Office Mobile is now free. Previously, these phone-focused apps required an Office 365 subscription. But with a new mobile platform to exploit, Microsoft has decided to allow us to view, edit, and create Office documents on our Android phones without shelling out for a subscription.
So if you have a need for native Word, Excel, and PowerPoint editing on your phone, hop over to the Google Play Store and grab it. Note that this version of Office is optimized for phones, not tablets, so it's not quite as capable as the new Office for iPad. Still, you can't beat the price, right?