Internet down? 3 ways I use an old Android phone as a backup connection for my home router

· Source: News and Advice on the World's Latest Innovations | ZDNET · Field: Technology & Digital — Cloud Computing & IT Infrastructure · Depth: Intermediate, medium

Summary

This article details three methods for utilizing an old Android phone as a backup internet connection for a home router, addressing common outages like those experienced in the UK due to record-breaking temperatures of 99.1°F/37.3°C in June 2026. The primary goal is to maintain router-level connectivity, avoiding the need to reconfigure Wi-Fi settings on numerous devices. The first method, USB tethering, involves connecting the Android phone to the router's USB-A port and enabling USB tethering, potentially requiring third-party firmware like OpenWrt or DD-WRT for basic routers. The second, less common method is Wi-Fi hotspot (WWAN), where the router connects to the phone's hotspot, a feature often found in travel routers such as GL.iNet models. The most recommended approach is Ethernet tethering, which uses a USB-C-to-Ethernet adapter and an Ethernet cable to connect the Android phone to the router's WAN port, requiring minimal configuration. While USB tethering and Wi-Fi WWAN allow phone charging, Ethernet tethering requires a separate charging solution, like a Power Delivery USB-C multi-port hub. iPhone compatibility is limited, with no support for Ethernet tethering.

Key takeaway

For IT professionals or home users seeking robust internet outage solutions, consider repurposing an old Android phone as a router-level backup. This strategy prevents reconfiguring individual devices during downtime. You should prioritize Ethernet tethering with a reliable USB-C-to-Ethernet adapter for broad compatibility and ease of setup. Alternatively, explore USB tethering or Wi-Fi WWAN, checking your router's specific feature support or considering third-party firmware like OpenWrt for enhanced capabilities. Ensure the backup phone has an active data plan.

Key insights

An Android phone can serve as a router's backup internet via USB, Wi-Fi, or Ethernet tethering, maintaining home network continuity.

Principles

Method

Connect an Android phone to a router via USB tethering, Wi-Fi hotspot (WWAN), or Ethernet tethering using a USB-C-to-Ethernet adapter, then enable the respective tethering option in Android settings.

In practice

Topics

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Editorial summary, takeaway, and curation by AIssential. Original article published by News and Advice on the World's Latest Innovations | ZDNET.