With pinggy.io you can reach Claude Code UI from your phone with just a single command. Replace the port 3001 with the port where it is running.
Claude Code UI checks the Host header, so the command rewrites it back with u:Host:localhost:3001.
Pinggy will give you a URL like https://ranlkfsbjkxry.a.pinggy.link. Open it on your phone to check on a running agent, answer its questions, or start a new task.
This gives a browser shell on the machine running your coding agent, so treat the URL as a credential. Turn on Password Protect above before you share it anywhere.
For the full walkthrough, see remotely managing Claude Code from your phone.