Solar charging in mobile (cell) phones.
I could understand it when all the phone companies were making their products smaller & smaller with every new line but now our phones have huge screens the phones are once again getting large & it seems to me that there is a great deal of wasted space that could accommodate strips of solar cells.
My own phone has around 15 square cm of space around the outside alone, added to that there is around 42 square cm of space on the back that could be made use of for something more useful than the manufacturers logo.
I wouldn't expect to dispense with the wall wart altogether but surely it would help to extend the sometimes pitiful life of our mobile technology if it could gather a little energy from the sun.
Any ideas why this isn't being included by the likes of Apple, Samsung & the other manufacturers folks? preferably in terms a non electronics expert can understand :-)