Smart plugs, bulbs, doorbells and budget cameras almost all speak 2.4GHz only, and BT hubs broadcast both Wi-Fi bands under a single network name by default. That combination is why so many smart-home setups stall at the final pairing step. Whether you can properly split the bands depends entirely on which BT hub you own: the original Smart Hub has a genuine Separate bands toggle, the residential Smart Hub 2 has no split option at all, and the newer Smart Hub Plus solves it a third way with a feature called Compatible WiFi. This guide gives the exact steps for each model through Hub Manager at 192.168.1.254, plus the temporary 5GHz switch-off that gets stubborn devices connected on the Smart Hub 2.
The original BT Smart Hub splits its Wi-Fi bands: log in at 192.168.1.254, open Advanced Settings, then Wireless, and switch Separate bands to ON. The residential Smart Hub 2 cannot split the bands at all, so the working fix is to switch off 5GHz in the same Wireless menu, pair your 2.4GHz smart device, then switch 5GHz back on.
Key Takeaways
- The original BT Smart Hub splits the bands with the Separate bands toggle under Advanced Settings, then Wireless, in Hub Manager at 192.168.1.254.
- The residential Smart Hub 2 cannot split its bands at all, because BT removed the option so Complete Wi-Fi discs can share one network name.
- The honest Smart Hub 2 fix is switching the 5GHz band off, pairing the smart device on 2.4GHz, then switching 5GHz back on.
- The phone running the setup app is what needs to sit on 2.4GHz during pairing, and everything reconnects by itself once 5GHz returns.
- Home Hub 4 and 5 split through the Sync with 2.4GHz setting, while the newer Smart Hub Plus adds a separate 2.4GHz network called Compatible WiFi.
Band splitting on a BT hub depends entirely on the model
Every BT hub from the Home Hub 4 onwards broadcasts on two bands. The 2.4GHz band travels further and gets through walls better, while 5GHz is faster over short range. By default the hub gives both bands one shared network name and quietly decides which band each device uses. That works fine for phones and laptops, but cheap smart-home kit only has 2.4GHz hardware, and many setup apps fail when the phone doing the pairing is sitting on 5GHz at the moment it tries to hand over the Wi-Fi details.
Splitting the bands gives each one its own name, so you can deliberately join the 2.4GHz network during setup. Whether your hub allows that depends on the model, and the model name is printed on the base label and on the pull-out settings card, so check there first. The original BT Smart Hub, the black hub BT shipped from 2016, splits cleanly with a single toggle. The older Home Hub 4 and Home Hub 5 also split, through a slightly different menu. The Smart Hub 2, the hub supplied with Digital Voice from 2019 onwards, cannot split at all, and the newer Smart Hub Plus takes a separate route. Each model gets its own section below, with the honest limitations first.
The original BT Smart Hub splits bands with the Separate bands toggle
On the original Smart Hub the job takes about two minutes. From a phone or computer connected to the hub, type 192.168.1.254 into the browser address bar. If the login itself gives you trouble, the BT Smart Hub login guide covers the address, the HTTPS prompt and the password card in detail. Select Advanced Settings, enter the admin password from the pull-out card on the back of the hub, then select Wireless.
On the Wireless page, set the Separate bands switch to ON. The hub automatically creates a new network name for the 5GHz band, and you can edit that name as long as it contains no spaces. BT suggests keeping it obvious, for example your existing name with 5GHz added on the end. Click Save and let the hub apply the change.
Expect devices to lose connection briefly after the split, because the network they knew has effectively been renamed into two. Reconnect each device to the band that suits it: phones and laptops to the 5GHz name for speed, and smart-home devices to the 2.4GHz name. Once split, pairing new smart devices becomes trivial, since you simply join your phone to the 2.4GHz network before running the setup app.
Home Hub 4 and Home Hub 5 split through the 5GHz sync setting
The older Home Hub 4 and Home Hub 5 also allow a proper split, just with different wording. Log in at 192.168.1.254, go to Advanced Settings and continue past the warning, then open the Wireless tab and select the 5GHz Wireless option.
Set Sync with 2.4GHz to No. That unlocks the 5GHz band's own settings, so change the Wireless SSID field to a new name, and again BT recommends simply adding 5GHz to the end of your existing network name so both stay recognisable. Click Apply.
After a few minutes two network names appear in the Wi-Fi list on your devices. Everything you own carries on using the original name, which remains the 2.4GHz network, so smart devices already connected stay connected. Anything you want on the faster band needs joining to the new 5GHz name manually. For smart-device setup the behaviour is ideal: join the phone to the original 2.4GHz name, run the app, and the device pairs without a fight.
The residential Smart Hub 2 cannot split its bands, and that is official
This is the part most guides fudge, so here it is plainly. The residential BT Smart Hub 2 broadcasts both bands under one network name, always, and Hub Manager contains no Separate bands toggle. BT's own help page on splitting the hub SSID lists the original Smart Hub and the Home Hub 4 and 5, and confirms the Smart Hub 2 does not support splitting. The reason is Complete Wi-Fi: the mesh discs BT sells alongside the Smart Hub 2 need the same network name on both bands to steer devices around the house, so BT removed the split option from the hub designed to partner them.
One warning about confusing search results. The BT Business Smart Hub 2 runs different firmware and its documentation genuinely does mention a Separate Bands setting, so business guides look tantalisingly relevant. They do not apply to the residential hub. There is no hidden URL, secret menu or firmware trick that restores band splitting on a home Smart Hub 2, and any forum post claiming otherwise is describing the business model or an older hub. The honest options are the temporary 5GHz switch-off below, or replacing the Wi-Fi side of the hub with your own equipment.
Switching off 5GHz temporarily gets smart devices connected on a Smart Hub 2
The workaround relies on one insight: during app-based pairing it is your phone, not the smart device, that must sit on the 2.4GHz band, because the phone broadcasts the network name and password for the new device to copy. With both bands sharing one name, phones prefer 5GHz and cannot be forced onto 2.4GHz manually, and iPhones are particularly stubborn about it. Take 5GHz away for a few minutes and everything, phone included, lands on 2.4GHz.
Open 192.168.1.254 from a connected device, select Advanced Settings, then Wireless, and enter the admin password from the pull-out card. The Smart Hub 2 lets you control each band independently on this page, so open the 5GHz band's settings, switch that band off and save. The 2.4GHz band keeps running throughout, though expect a brief Wi-Fi wobble while the hub applies the change.
Now run the smart device's setup app while standing near the hub. With 5GHz gone, the phone and the device share the 2.4GHz band and the pairing that kept failing usually completes first time. Once the device shows as online, go back into Advanced Settings, then Wireless, and switch 5GHz on again. If the device still refuses even with 5GHz off, the fault is usually on the device side, and the smart plug will not connect guide works through those causes.
Complete Wi-Fi discs and re-enabling 5GHz afterwards
Two snags catch people out. First, Complete Wi-Fi discs rebroadcast the same network on both bands, so a phone standing next to a disc can cling to the disc's 5GHz signal even while the hub's 5GHz band is off. Do the pairing close to the hub itself, and if it still misbehaves, unplug the discs for the few minutes the setup takes, then power them back up afterwards.
Second, people worry the paired device will vanish when 5GHz comes back. It will not. The smart device stays on 2.4GHz permanently because its hardware supports nothing else, and it does not care what the other band is doing. Phones, laptops and tablets drift back onto 5GHz by themselves since both bands share one name. The only disruption is a short drop in Wi-Fi each time you change the setting while the hub re-raises its signal, which is normal. If the hub's light does anything unexpected while settings apply or after a restart, the BT Smart Hub lights guide decodes every colour so you can tell a routine blip from a real fault.
The Smart Hub Plus takes a different route with Compatible WiFi
Newer BT and EE full fibre installs come with the EE-built Smart Hub Plus, and it handles 2.4GHz-only devices with a purpose-made feature rather than a traditional split. Compatible WiFi creates a second network that runs on 2.4GHz alongside your main Wi-Fi, with its own name and password. Devices on Compatible WiFi and devices on the main network stay on the same home network, so your phone's apps keep controlling the smart devices regardless of which network each one uses.
The quickest way to turn it on is in the EE app. Without the app, log in to Hub Manager, select Advanced Settings, then Wireless, then Compatible WiFi, give the network a name and password and save. The feature arrived through a firmware update, so a hub that does not show it yet needs to pick up the latest firmware, which the hub fetches automatically when left powered on. Hub Manager also offers an option to add the 5GHz band to the Compatible WiFi network. Leave that off, since a 5GHz signal on the compatibility network recreates exactly the problem the feature exists to solve. Join each smart device to the Compatible WiFi name once and it never fights the main network again.