jcdr writes: More and more mobile phones have a USB port capable of operating in host mode. But very few of them are capable of powering a USB device by themselves, without using another power source. The problem is complicated by the fact that manufacturers rarely provide the exact specification of the USB host mode. This makes it not easy to find a phone that can power a device, and buying all the possible candidates would be extremely expensive, not including the time for testing. I'm looking for experiments to find out which mobile phones currently available for sale have been shown capable of powering a USB device that consumes less than 100mA current.