Apache page works on my laptop but not on my phone

This is probably a network-access issue rather than an Apache content problem. Find the laptop’s IP address, then test whether the phone can reach it. If the phone cannot even ping or connect to that address, check the Wi-Fi connection, network isolation settings, and the laptop’s firewall.

Make sure the firewall allows incoming HTTP traffic on port 80, and HTTPS on port 443 if you are using HTTPS. Also verify that Apache is listening on the laptop’s network interface, not only on 127.0.0.1 or localhost. Apache’s listen and virtual host settings are worth checking.

First check whether the phone is connected to the same local Wi-Fi network as the laptop. If the phone is using mobile data, it won’t be able to reach a private address such as 192.168.x.x unless you configure external access and port forwarding. Use the laptop’s local network IP address in the phone’s browser.