Can You Use Mobile Broadband (USB Tethering) on Xbox 360?

No. The Xbox 360 does not support USB tethering or mobile broadband dongles natively. Its network stack only recognizes Ethernet (wired) or Wi-Fi (via the internal adapter or the external 802.11n USB dongle sold by Microsoft).

Why It Doesn't Work

• Driver Architecture: The 360's OS lacks the modem drivers and PPP/NDIS stack required to communicate with cellular modems.
• USB Port Limitations: The ports are host-only for peripherals (storage, controllers, keyboards), not for network interfaces.

Workarounds (Not Recommended for Gaming)

1. Mobile Hotspot → Wi-Fi: Enable hotspot on your phone, connect the 360 to that Wi-Fi network. Caution: High latency, strict NAT, data caps, and instability make this terrible for multiplayer.
2. Travel Router (e.g., GL.iNet) in Tethering Mode: Plug phone into router via USB, router broadcasts Wi-Fi to 360. Slightly more stable, but still suffers from cellular latency.
3. Internet Connection Sharing (ICS) via PC: Bridge phone tethering to PC Ethernet port, run cable to 360. Complex setup, adds hop latency.

Best Practice

For any online gaming, a wired Ethernet connection to a stable broadband router is the only reliable solution. If that's impossible, a dedicated 4G/5G home router (with external antennas) bridged to the 360 via Ethernet is far superior to phone tethering.