iPhone Mobile Safari & Cookies
Cookies must be enabled to log in on AudioBoo, or to link accounts. Without enabling cookies, you're likely to see a "your request was rejected for security reasons" page.
On the iPhone, enabling cookies isn't quite so straightforward as it might appear.
You can enable cookies by going to the iPhone's Settings app, then Safari -> Accept Cookies, and setting it to 'From Visited' or 'Always'.
However, even after having done that, Safari will persist with its old cookie setting until it is fully restarted. You can restart Safari by launching it, then holding the Home Button for 5 seconds, or simply by restarting your entire phone.