I'm quite possibly the target market for solar charging my phone. I spend days on end away from any power sources sometimes bicycle touring. I don't think a SolarTOH is very useful to me. 1) it's on the back. My phone is usually facing up, on my bars with mapping running or in a bag keeping dry. It'd not get any charge. 2) I'm always moving so keeping it facing sunlight would be tricky. Also, northern Europe so not exactly guaranteed sunshine. 3) It's too small to generate enough power compared to hub generators or much larger solar panels. I use a hub generator - 6v 3w at average cycling speed which feeds a buffer battery and then delivers USB 5v. 4) You'd have to leave the phone out in the open for hours to charge which generally isn't something you want to do with expensive kit on campsites or whatever. What I need is a mega efficient transparent solar panel on the front of the phone so you could have it face up and using it.