Question: iPhone11 need to find if it a built-in Ethernet port

An iPhone would only represent a tiny fraction of the radio waves that bombard you each day. Police, fire, emergency, airplanes, radio, television, microwave, satellite signals and countless other cell phones and Wi-Fi signals.

Keep in mind that you will need to select a cellular carrier if you buy an iPhone. You won't be able to set up the iPhone unless you have a carrier selected. Cell towers all around you will be transmitting constantly to you and everyone.

I'm sorry but you are kidding yourself if you are worried about an iPhone. If you really are, get a landline phone, if you can find one. But, it won't make any difference as far as your total exposure each day.

Good luck

So your going to keep your phone tethered to an Ethernet cable and not use WiFi or cellular data or leave your house with the phone?

Why not just use a landline phone then?

Does your router support leaving the Ethernet ports turned on but shutting the WiFi transceiver off?

iPhone 11 has a Lightning Port, which can be used for either charging or data transfer. No Ethernet port on the iPhone 11.....or any other iPhone for that matter.

Just out of curiosity, why do you want to use an Ethernet connection?