how can solar power recharge a mobile phone.
As orksecurity said, you can get wind-up chargers for your phone, but they are a stop gap measure.
You can also get solar powered phone chargers, which will require a day to charge, but if your outside, it won't matter too much.
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just get one of those solar powered garden lights and hook a usb port where the light was. possibly figure out how to reduce the voltage to 5 volts.
Sure. All you need is the correct voltage at sufficient current.
The problem is, phones use a surprising amount of power. I have a hand-crank generator which can charge my phone (one of the Eton emergency flashlight/radio/charger units), and they advise us that it will take ten minutes of cranking to charge most phones enough to make a one-minute call.