Let the hive mind of Engadget get that for you.
"I own an iPhone 3G and I'm looking for a decent speaker / alarm clock for it. I am going to listen music in a mid-sized room, so I want nice quality speakers with solid bass. I also want to use it as an alarm clock, so it would be great if there is such a feature. The price can be low-mid to mid-high range. I was looking at the Klipsch iGroove SXT; it's powerful, slick and the reviews are good, but it doesn't have an alarm clock feature. It's no deal breaker if I can set it up from the iPhone, but I'm not sure. Thanks!"
Go on, then, how? You'll make a hoard of Symbian OS developers very happy if it is possible. You can certainly switch off blocking of developer certificates on the device, but you can't switch off certificate checks completely... (There is a 'self signed' concept, but you are pretty restricted in the APIs you can use).
If you can demonstrate an application installed which uses manufacturer-granted capabilities (i.e. restricted APIs) without a developer certificate or signed by a manufacturer I will eat my hat. Twice.