I was given a SolarMonkey and SolarNut as a gift. I have a Blackberry phone and the required connector (power tip) is not supplied with it. I managed to get one easily from PowerTraveller. So far so good. Unfortunately, when I tried to charge my phone, the green light illuminated on the Monkey, the red light appeared on the nut and the charging symbol showed on my Blackberry, but the phone didn't charge - in fact, what little charge was on the phone seemed to drain away. As you do, I looked at a number of reviews which suggested that it might not be designed to charge a smartphone. I decided to contact PowerTraveller to find out whether I needed to upgrade the Monkey, the Nut, or both. I was delighted by the response from PowerTraveller. They asked a few questions about what lights were showing and when, and then sent me a new SolarMonkey, SolarNut and power tip. My phone now charges very quickly in daylight (even on a cloudy day in Scotland). The only obvious difference I can see is that the green light on the replacement Monkey is much brighter than on my old one. This gadget does work very well indeed and their customer service can't be faulted.