Please no. Phones go into tunnels, run out of battery, and go indoors where there's a poor signal or none at all. They make terribly unreliable servers. Not to mention how much faster this would chew up battery life. If you want to keep a spare phone plugged in all the time in your closet, connected to Wifi/Ethernet, and hack it to be a webserver, then go ahead. But webservers on mobile devices, being used in a mobil…
even this low bar is (imo sadly) currently impossible for someone who just has a spare phone in their closet and a bit of html knowledge
looking forward to the unicorn that makes wordpress for ios/android