Question about Overmax Multipic 2.5

It should work with an iPhone-HDMI adapter, but I haven't tried it.

I don't use an iPhone (plugged into MS Surface) but I think it should be possible via Miracast. Link to the corresponding manual page (Vers. 2.4) - hope it helps.
https://www.manualslib.com/manual...

Don't know. I don't know IPhone. But I suspect not: the beamer only has an HDMI output. No Bluetooth. Furthermore, it is difficult to get a sharp picture (everywhere) with the beamer. - Nice toy, but for a good beamer you probably have to spend more money...