PDBMobile and iOS 5.1
Changes made in the latest iPhone operating system will break existing installations of PDBMobile. iPhone users running the new iOS 5.1 should delete and then reinstall PDBMobile. Fresh PDBMobile installations will work on iOS 5.1, or any of the previous iOS versions above version 4.
A new and improved version of PDBMobile will be available in the app store this spring.
More information about PDBMobile is available in the FAQ.