But will it break lots of apps? Assuming access to the UDID – and absolutely nothing else – is... dumb. What happens when users change devices, for example? I'

But will it break lots of apps? Assuming access to the UDID – and absolutely nothing else – is... dumb. What happens when users change devices, for example? I'm having a hard time imagining any large number of apps that are that reliant on this one thing. Even OpenFeint had provisions to handle non-UDID-based account authentication.