Wanted to use this with a Nokia E7 but didn't charge, tried another phone, same problem. Tried an old iPod Nano, worked fine. Belkin sell this as an Apple accessory so I guess I can't really complain. However there is an expectation that USB mean universal and should work with any USB device. Belkin have missed the point here, Apple may be the flavour of the month but there are 100 other devices that they could cater for easily for every Apple device. Lot of lost sales.
-Update: Did some research on this issue. It turn out there is an international standard for delivering charge to a mobile device via USB. This requires the device to ask the power source for permision to draw power if the device is a dumb device (such as this one) then it should "short out pin's 2 and 3 (D+ & D-) with a resistance of no more than 200 ohms". This device does not do this, hence won't work with a device that complies with the standard. Nokia devices appear to comply with the standard and Apple devices don't.
I tested the theory by taking the device apart and soldering pins 2 and 3 together. All my dvices now work with this now, including my Apple ones. Come on Belkin wake up its a tiny zero cost fix and gives you a larger market.
(See Wikipedia: On October 22, 2009 the International Telecommunication Union (ITU) announced that it had embraced the Universal Charger Solution as its "energy-efficient one-charger-fits-all new mobile phone solution", and added: "Based on the Micro-USB interface, UCS chargers will also include a 4-star or higher efficiency rating--up to three times more energy-efficient than an unrated charger.")