Only if the Iphone charger is a USB-C PD rated charger.

Yes, theoretically the Framework should charge even on a standard 5V charger without Power Delivery (very slowly of course). However there might be incompatibilities.

Should be fine to try, but I wouldn't use a very cheap charger, because who knows what shocks that could give to the delicate Framework electronics. But Apple should be fine.

20W is enough for lightweight use. Just don't run anything intensive to avoid the battery draining.

Yeah, should work. Mine charges with an 18W PD Google Pixel charger even while powered on. Although sometimes I have to retry a few times before it accepts a charge.

Interestingly, I occasionally use my steam deck 45w charger for my framework. From totally dead, it won’t recharge or let me boot when plugged into the front left port, but will from the front right port.

Once it’s powered on, either one will charge it.

I tried it with a no name 20w charger and it eventually had to shut down, but did get me to 25% after a few hours.

I have a dedicated 65w GaN charger now 😊

Yeah, but it will be very slow. I had the same issue on my Samsung Galaxy Book2 when its charger failed, and my laptop would only accept 0.8-1W of power from my 15W phone charger 😑