I don't own an IPhone, instead I have a Android based HTC Hero phone.

As some posters have already pointed out, these small solar chargers require a lot of time for recharging.

Many people, espcially in the US (due to high coverage in many locales) take their phones out on the trail backpacking. When would you time to charge the phone for hours at a time during the day and in the strongest sun hours?

For those who do not have an Iphone, you are better off purchasing a spare battery for your phone. For example, the battery for my HTC phone is about $20.00. With 2 batteries and judsious use including keeping the phone turned off when not needed, this amounts to 10's of days of run time before both batteries would be drained.

Ad for car camping and car travel in general, you are much better off getting a small 12 volt to 110 volt inverter that has an ac plug outlet and an USB power connection for charging your gadgets. The invertor I have cost $24.00 and will charge almost anything including my HTC phone battery, netbook battery, DSLR camera battery, GPS battery, AA batteries etc with barely any drain on the car battery even when the engine has not been running for hours. I have been charging my gadgets and batteries with this method for a couple of years with no problems.