Maybe they've improved since I last bought one a few years ago but my experience wasn't good. My A5 paper size (roughly) one could be left in the sun for days and nothing much would happen. I'd guess you'd need something the size of a door to charge anything before the warranty on it runs out.
If anyone else says they've managed to charge an iPhone from a solar panel that costs less than an iPhone I'd be interested in what and how much and where and how you did it.
Is this for backpacking or similar? If you're on a bike, with loads of volts and stuff available, why not just use a car charger - or the circuitry from one anyway. If you're on foot or just want a plug and play solution have you thought about one of the external battery things - something like this: Power Bank 8400mAh Emergency Battery Portable External Phone Micro USB Charger | eBay
and just charge it up every now and again.
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