I am looking for a USB hub to connect mouse/keyboard simultaneously to my phone while powering/charging the phone ("power delivery"). I would like to be able to connect one or two other peripherals, so 4-5 ports including the phone connector would be ideal.
Ideally it should also be possible to use it without mains adapter too, for instance, plugging it into a computer to power it, even if it reduced performance, but this isn't essential.
Reading a bit more, I think it needs to support USB Power Delivery v2.0 and have a mains power option.