Plates are cheap
Yes, you can buy the branded ones for a fortune, but you can get no-name Chinese plates for under £20 on Amazon - which work brilliantly. There is even one for the car which holds it in place like a satnav (although I have the fifty quid Nokia one as I didn't see the cheaper one first :( )
Now you can get wireless external batteries as well, you can charge on the move.
No excuse for not having them all over the place. Should be in every phone. I pity the primitives still using wires!