Turn an old phone into a Wi-Fi repeater

An old smartphone can become a useful Wi-Fi repeater, provided its software supports sharing an existing wireless connection. It can carry a broadband signal beyond a router’s usual reach, helping phones, laptops, TVs and smart-home devices stay online in areas where the signal fades.

This is particularly handy in Australian homes. Thick brick walls, concrete floors and long single-storey houses can create dead zones even when an NBN service is fast at the point of connection. Apartments in Sydney, Melbourne, Brisbane and other dense cities often have Wi-Fi concentrated near one router, while regional properties may rely on fixed wireless or a 4G connection that benefits from better internal distribution.

There is one important limitation. The handset must receive internet through Wi-Fi while simultaneously creating a new hotspot. Many Android phones offer hotspot sharing through mobile data but cannot perform that Wi-Fi-to-Wi-Fi bridge, and Apple’s standard Personal Hotspot normally shares cellular data rather than an existing network.

The steps below begin with checking compatibility, followed by configuration, placement and testing. They also explain when a travel router or mesh node may be a more dependable solution than an ageing handset.

Check whether the handset can share Wi-Fi

Start with the phone’s model and operating system. On Android, look under Settings for Hotspot and tethering, Tethering, Connection sharing or Network sharing. Depending on the manufacturer, the required option may be called Share Wi-Fi connection, Wi-Fi repeater, Wi-Fi sharing or Internet connection sharing.

A standard Wi-Fi hotspot is not always a repeater. If the feature only mentions mobile data, cellular data or the SIM, it probably cannot extend an existing broadband connection. Wi-Fi Direct is also different: it creates a local wireless link but does not automatically forward internet access from the router.

Checking the specifications before buying a replacement device can save time. TechnoMeniac’s phone reviews are useful for comparing Wi-Fi hardware, battery condition and supported features across different models.

Older phones may support the required function but need updated firmware. Install pending system updates, remove unused applications and confirm that the hotspot can broadcast on both 2.4 GHz and 5 GHz if possible. The 2.4 GHz band generally travels farther, while 5 GHz delivers better throughput over shorter distances.

Configure the repeater

Begin by charging the handset and backing up its data. Connect it to the home network using the normal Wi-Fi menu, then return to the hotspot or connection-sharing settings. Enable the option that shares the current Wi-Fi connection, rather than selecting cellular data as the internet source.

Choose a new network name that identifies the extended network, such as Home Wi-Fi Extended, and create a strong password. If the phone offers separate 2.4 GHz and 5 GHz networks, connect nearby portable devices to 5 GHz for speed and place distant devices on 2.4 GHz for coverage. A single combined network is simpler, although the phone may choose less suitable bands for some clients.

Save the settings, wait for the network to appear and connect a laptop or second phone. Open a speed-test page or stream a short video to verify that the repeater is forwarding traffic. A successful connection to the hotspot is not enough on its own; the upstream router must also recognise the new device.

Position the phone for better coverage

Place the repeater between the main router and the weak-signal area, not beside the router. A hallway shelf, near the top of a wall or on a timber side table can work better than a position behind a television, under a desk or beside a metal appliance. Keep it open to the air because hotspot transmission and simultaneous Wi-Fi use can generate heat.

In a typical Australian house, try the phone near the middle of a long living area or hallway. In a two-storey townhouse, a landing or upstairs cupboard may provide a useful bridge. Avoid placing it beside the NBN equipment, since the new access point should appear as a separate network rather than attempt to replace the NBN connection itself.

For crowded city apartments, start with 2.4 GHz to penetrate walls and neighbouring-building interference. In regional areas, the source connection may come from a Telstra, Optus or Vodafone fixed-wireless service, so the repeater will still be limited by the quality of that upstream signal and the phone’s Wi-Fi antenna.

Keep the connection stable and secure

Run the phone from a reliable USB charger during extended sessions. Hotspot use consumes more power than ordinary Wi-Fi, and a depleted battery can shut down the network unexpectedly. Monitor the handset for unusual heat or swelling, stop using it if the battery is damaged, and keep software updated because router, tethering and security fixes are often delivered through system updates.

Use WPA2 or WPA3 encryption and a password that is different from the main router’s. Avoid open public hotspots in cafés or shared offices, particularly when the phone is carrying a home network. A separate network name also makes it easier to identify which devices are connected through the extender.

Expect the extended network to be slower than a direct connection. The phone must process traffic twice, and nearby users may share its bandwidth. If the main connection is a limited mobile-data plan, check its data allowance before enabling hotspot sharing; otherwise, clients could consume a substantial amount of cellular data without making it obvious.

Know when an alternative works better

If the handset lacks a native sharing option, installing an unknown application is not always a safe fix. Some repeater utilities require root access, can expose network traffic and may stop working after an Android update. Root a device only if you understand the security implications, and avoid using an old phone for online banking or other sensitive activity when it is running an unofficial tool.

A travel router is often more reliable when the phone cannot bridge Wi-Fi natively. The phone can supply internet through USB tethering, while the router broadcasts the network and handles wireless repeater or access-point functions. A mesh system is another option for larger homes, particularly where several floors need coverage.

A practical setup checklist

Use the following lists to keep the project predictable. The first covers preparation, while the second covers the connection and its final checks.

Before you start

Confirm that the handset can connect to Wi-Fi and broadcast a hotspot simultaneously.
Charge the battery fully and prepare a dependable USB power supply.
Record the home network name, password and preferred wireless band.

After connecting

Position the phone between the main router and the weak-signal area.
Use a distinct network name with WPA2 or WPA3 security.
Test several devices while monitoring speed, battery temperature and stability.

A stable signal, suitable placement and continuous power will usually determine whether the old phone works as effectively as a dedicated wireless extender.