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 mobile way, are a terrible idea.
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 mobile way, are a terrible idea.