Using your proxy on Android and iPhone

What the system can do on its own

	Android	iOS
Proxy over Wi-Fi	✅ HTTP only	✅ HTTP only
Proxy over mobile data (4G/5G)	❌	❌
SOCKS5	❌	❌
Apps covered	The browser, and apps that honour the setting — many ignore it	Same

Remember the second row: the native setting only works over Wi-Fi. The moment the phone falls back to mobile data, the proxy disappears without warning.

Android — Wi-Fi setting

Settings → Wi-Fi → long-press the network → Modify → Advanced options → Proxy: Manual.

Hostname: frproxy.com
Port: your HTTP port

Android offers no username / password field. On an authenticated proxy the browser will pop up a prompt; apps, on the other hand, will fail silently.

iOS — Wi-Fi setting

Settings → Wi-Fi → the ⓘ next to the network → at the very bottom, Configure Proxy → Manual.

Server: frproxy.com
Port: your HTTP port
Authentication: turn it on, then enter username and password

iOS handles authentication, unlike Android. That is the one point where it is better here.

To cover the WHOLE phone, mobile data included

You need an app that raises a local tunnel and sends system traffic into it:

Android: Every Proxy, ProxyDroid (root), or any SOCKS5-capable client.
iOS: Shadowrocket (paid, ~$2.99) or Potatso. These install as a VPN profile — that mechanism is what lets them capture other apps' traffic.

This is the only method that works on 4G, and the only one that covers apps which ignore the system proxy.

The WireGuard case

If you have WireGuard access with FRProxy, forget everything above: install the official WireGuard app, import the config file or scan the QR code from the panel, and switch the tunnel on. The entire phone goes through the French mobile line — Wi-Fi and 4G alike, apps included, with no per-app setting.

By far the simplest option on mobile.