Wells Fargo is a large US-based bank and Financial Services Company. They predictable have banking apps for Android, iPhone and iPad, but also BlackBerry and even the extinct Palm OS, but not unfortunately for Windows Phone.
As is the case with many banks however, it appears this is about to change, with the company telling reader Dominick in the above email that the app is already in development.
Presumably the app, when delivered, would have similar features to the iOS and Android app, which allows check deposit, fund transfer, balance information, and directions to the nearest ATM.
Keep an eye on their apps page here for the app to pop up (eventually).
Thanks Dominick for the tip.