That's what this poncho-like jacket from Anker Solix, the solar and energy storage tech branch of Anker, aims to do. I saw a prototype of it at Mobile World Congress in Barcelona

Of course, to take advantage of the charging case, the phone would have to have wireless charging as there's no other connection from the case to the phone. The advantage of this

Chinese phone brand Infinix is known to show off a flashy concept, and at this year’s MWC the company is looking skyward for inspiration. It’s showing a phone with an integrated solar panel on the back,