Startup Idea : Mobile phone charging via WIFI signals

Pain: Currently we are so much dependent on mobile phones that if this gets switched off due to battery outage, it becomes so very difficult to manage especially when we are not carrying the power bank as back up. Solution: To overcome this situation, I am thinking of developing a device which can help to charge the mobile phones via WIFI signals (used for connecting to Internet). Since we are connected to WIFI almost everywhere at Home or public network this will help to reduce the dependency on wired charging. This is just an idea, I am not sure if technically it is feasible, but if this idea can be turned to reality, it would be game changer in the mobile charging space.