Well, if your mobile device can view a simple web form, then you can use it. Any device with a browser and internet connection, basically.
I'll make a multi-user version with a login in the coming weeks and try to share it. Maybe I can make a gateway to the logger on ecomodder, so that your entries also show up here. I'll have to do a bit of research on that one. :P
At this point, it just looks like this:
It finds the last mileage entry in the database and automatically figures out how many miles you've driven from that, which is why there's no "miles" entry, just "odo".