I have a doubt about 1111 on how it works. Is 1111 hides my public ip like other vpn services?
No, it is not a VPN service. If you’ll use it in an encrypted manner [like DoH] it will make your ISP not be able to sniff / change your DNS responses, but your traffic to websites still goes through your ISP and those sites will still see YOUR IP connecting. If you want to avoid that, you need some VPN or Proxy service such as Tor.