The famous British personality is well known for his love of all things Apple and is quite fond of his iPhone too. In fact, Fry doesn't seem to be swaying from his love of the iPhone as he took its picture with his Lumia 900.
The evidence comes from this Tweet where the actor comments "My iPhone, pimped into @NCFC colours by the geniuses from @JailBreakCon - I'm blissed out!". The Tweet itself comes from "Microsoft" which we know is the default reference for Windows Phone. In addition, a quick look at the EXIF data from the photo (hosted on SkyDrive) reveals that the photo was indeed taken with a Lumia 900.
Unfortunately, a quick peruse of his Twitter timeline reveals he also has an Android device too and the Lumia 900 gets no mention from him. Meaning? We assume Mr. Fry was given a promotional phone at some point and unfortunately just never really took to it. Still, maybe he just picked it up and is giving it a go. Either way, we won't hold it against him.
Source: Twitter; Thanks, Craig H., for the tip