Your solar cell charger is going to take days/weeks to charge the phones battery. It's current output is at best 6.3V @ 8.3mA (0.05W) and your phones battery is 5.7V @ 800mA (4.5W). Plus you're boosting the panel to 9V (if you're lucky it's >80% efficient)
What power output does the charger that came with the phone put out?
i have used the circuit that collins posted and it gives me a varying output (10.7 v to 11.7 v ) from a 3 v input (i mean in the simulator) but i still worried that it will fail since it's varing to values and when i tried to put zener diode to regulate the output the circuit doesn't work (it's started to go slowly)
if you bother yourself and look at the attachemnet in the first post you'll find a circuit .
and tell me if you please what is wrong with it , and what is wrong with the circuit that collins post it ?