Wi-Fi 2.4 GHz or 5 GHz: Which Network to Join, Why Devices "Can't See" 5 GHz and How to Set Up Your Router Properly

Modern routers broadcast Wi-Fi on two bands at once — 2.4 and 5 GHz — and sometimes a third, 6 GHz. Your list of networks often shows two similar names: "MyWiFi" and "MyWiFi_5G". Many people connect to whichever comes first without realising that the choice affects speed and stability. Others run into oddities: a smart bulb can't find the network, an old laptop sees only one of the two. Let's look at how the bands differ, which one each device should use and how to set up your router so everything just works.

The 2.4 GHz band

• Pros: longer range, passes through walls and floors better, and is supported by absolutely every device, including old ones and smart home gear.
• Cons: slower — usually up to 50–100 Mbit/s in practice; only three non-overlapping channels, so in an apartment block the airwaves are crammed with neighbours' networks; interference from microwaves, Bluetooth, baby monitors and wireless cameras.

The 5 GHz band

• Pros: much faster — hundreds of megabits; many channels, with less interference and fewer neighbours; lower latency — better for gaming and video calls.
• Cons: shorter range and weaker through walls — through two or three concrete walls the signal can vanish; not supported by some old devices and most smart sensors and plugs.

The 6 GHz band (Wi-Fi 6E and 7) continues the same logic: faster and cleaner still, but even worse through walls, and only for new devices.

Which band for which device

• A TV, set-top box or gaming PC near the router — 5 GHz, or better still a cable.
• Laptops and phones in the same or next room — 5 GHz.
• Devices in far rooms, on the balcony or in the yard — 2.4 GHz, if 5 GHz doesn't reach.
• Smart plugs, bulbs, sensors, cameras, robot vacuums — 2.4 GHz, often the only option.
• Old laptops, printers and media players — 2.4 GHz, if they don't support 5 GHz.

One network name or two

Many routers can combine the bands under one name (band steering or Smart Connect): the device switches to the best band by itself. That's convenient, but it sometimes works poorly — a phone "sticks" to slow 2.4 GHz or keeps jumping between bands, and smart devices can't connect during setup. Separate names give you full control: you choose which device goes where. The best option depends on your flat and your devices.

Why a device can't see the 5 GHz network

• The device doesn't support 5 GHz — typical of smart home gear and old laptops.
• The router uses 5 GHz channels the device doesn't support because of regional settings.
• The 5 GHz network is switched off on the router or hidden.
• It's too far — the 5 GHz signal doesn't reach.
• The laptop's Wi-Fi driver is outdated.

Channels and channel width

On 2.4 GHz it's best to use channels 1, 6 or 11 and a 20 MHz width — a wide 40 MHz channel in an apartment block only adds interference. On 5 GHz, channels of 80 MHz and more are available, giving high speed, but with lots of neighbouring networks a narrower channel is sometimes more stable. The router's automatic channel selection doesn't always cope, especially in dense housing: it's better to look at how busy the airwaves are and pick a free channel manually.

Common mistakes

• The TV in the next room is on 2.4 GHz — high-quality films freeze.
• A wide 40 MHz channel is enabled on 2.4 GHz in a high-rise — constant interference.
• The router sits in a corner of the flat — 5 GHz doesn't reach the far rooms.
• Trying to connect a smart plug to the 5 GHz network or a combined network — the device won't set up.

What our technician does

1. Analyses the airwaves: which channels neighbours are using and where the signal is weak.
2. Sets the bands, channels and channel width optimally for your home.
3. Decides whether to use one network name or two, and connects each device to the right band.
4. Sets up smart home devices, printers and older equipment.
5. Extends coverage with a mesh system or access points if needed.

A real example

A family in Saburtalo complained that the TV kept freezing during films and that their new smart plugs wouldn't connect. The router was in single-name mode, and the TV was clinging to 2.4 GHz on a wide channel that overlapped with a dozen neighbouring networks. Our technician split the networks, moved the TV and laptops to 5 GHz on a free channel and set 2.4 GHz to narrow channel 1 specifically for the smart home. The films stopped freezing, and all five plugs connected within a few minutes.

Router placement affects both bands, but 5 GHz especially. The router should sit in the open, at desk height or higher, close to the middle of the flat and away from metal cabinets, mirrors, aquariums and the microwave. Point the antennas vertically or at different angles. If the flat is large or has thick walls, consider a mesh system: every unit broadcasts both bands, so devices get fast 5 GHz everywhere.

A quick way to check which band a device is using: on Windows, the Wi-Fi properties show the band and the link speed; on phones it's in the network details. If a laptop next to the router is on 2.4 GHz, it's worth finding out why.

Call a technician

If your Wi-Fi is unstable or devices won't connect, we'll come to any district of Tbilisi around the clock. Learn more on our Wi-Fi setup, router setup and network troubleshooting pages.