If I get back to middle ages I will be smartest man on in the world - first question “so how do your mobile phones work actually and can you build one?”
Well great you can compare compute power but can you get to the LEO at least? I don’t think so.
If you ever get back there make sure to take every 1930s DIY book you can find. They have everything from legal advice to how to make a power rectifier from scratch as well as how batteries and radios work along with instructions for building them from valves. If you can make a vacuum pump it's not ever such a stretch to make thermionic valves (tubes for left-pondians). You could even make something like Konrad Zuse's computers with the technology that is already available.
The first generation won't be as good as the Apollo Guidance Computer though.
If I get back to middle ages I will be smartest man on in the world - first question “so how do your mobile phones work actually and can you build one?”
Well great you can compare compute power but can you get to the LEO at least? I don’t think so.