Hi all i am a newbie and have no experience in this field but do have an idea that will help Apple in the 3rd world countries
My idea is as follow (sorry for spelling)
if you take the case of the phone and instead of just a coulor you put in a Solar cellpack then the pack can charge the phone while you are outside or inside and depending on how you design it power can be restored to the phone while outside . There is sturdy protection cases available for the phones and if apple brings a new phone out that has this feature in it then the world will wake up.Also no other phone will be so Green .Battry life will also be longer and the end user will benefit from it more .
I had the same idea lol. If the outside of the phone case contained a solar cell, it can maintain power for a longer period and maybe even charge the battery. This will be a great feature to end battery life problems.