Like many of us I feel mobile phones have proved to be wonderfull inventions. I'm sure I'm not alone either in thinking their progress is being hampered by two things in particular.
1) Batteries. Having longer lasting batteries would be a great advantage.
There are probably a 1001 reasons why the following solution isn't possible at the moment but it's develpment could be the solution. Not being a technocrat I don't know how powerfull small solar panels are - similar to the ones found on pocket calculators. Is it possible to have them transparent. If this was the case then the whole front of a mobile phone could be a solar panel assuming they could be developed in such a way that enabled them to be touched in the same way as we touch screens now for use. A combination of solar panel and battery might be an interim solution.
2) Signals. Again you have to bear in mind my ignorance. Why is it that when it's posible to use GPS for location on a small mobile phone, masts and sim cards can't be replaced by satelites and a service provider's chip to pick up the signal? Any phone could then be used anywhere which would greatly enhance useability and safety. OK I know satellite phones at the moment are very large, but surely adapting the technology has to be the way forward.