Your phone doesn't ask you which network to join. It just picks one, based on whatever it decided last time, and gets on with it. Most days that's fine, because most homes only have one Wi-Fi network to choose from. The trouble starts when there's a second one sitting nearby, and your phone starts treating your good connection and a much worse one as interchangeable.
Your devices are making the switch, not you
Phones and laptops keep a memory of every network they've ever joined, and they'll reconnect to any of them automatically the moment it's in range, without asking. So if there's a portable 4G or 5G modem — the little battery-powered ones people call MiFi devices — sitting charged in a drawer, or an old router from before you had Plume installed still plugged in "just in case," your phone will happily hop onto whichever one answers first when you walk back into the house. It doesn't know that one of those networks is being intelligently managed and the other one is just sitting there on its own, doing nothing to help you.
This is why the same phone can behave perfectly in the lounge and then struggle the moment you walk into the bedroom. It's not that the signal got weaker there. It's that a different network won the handshake in that part of the house, and your phone settled for it without telling you.
The "evil twin" living in your house
In network security, an evil twin is a fake Wi-Fi network set up on purpose to trick people into connecting to it. What I'm talking about here is almost never that deliberate — it's leftover, not malicious. When fibre gets installed, the router the ISP leaves behind is often still broadcasting its own Wi-Fi network, even though your Plume SuperPods are up and doing the real work. An old TP-Link or D-Link kept around from years ago does the same thing if it's still plugged into a wall socket somewhere. So does that MiFi modem, if it's left switched on inside the house instead of only when you're travelling.
Every one of those is a parallel network. And a phone doesn't know the difference between "the network built to look after this whole house" and "a leftover box with one bar of range and nothing coordinating it." It just sees a name it recognises and connects. That's the evil twin — not sinister, just sitting there undermining the system you actually paid for.
Why Plume only works properly when it's alone
Plume's SuperPods are in constant conversation with each other. They're checking signal strength, congestion and which pod is best placed to carry each device, and quietly handing you off to a stronger one as you move through the house. That whole process depends on Plume actually having your device on its network in the first place. The moment your phone is sitting on a different network instead, Plume has nothing to steer. It can't fix a dead spot that isn't a Plume dead spot — it's dead because your phone chose the leftover router's one remaining bar over the strong Plume pod six metres away.
That's what makes this particular problem so frustrating to diagnose over the phone. From where you're standing, it looks exactly like bad Wi-Fi. From where I'm standing, Plume is doing precisely what it's meant to on its own network — your device is just on the wrong one.
Making your home a Plume-only network
Once your SuperPods are installed and working, switch off Wi-Fi broadcasting on the ISP-supplied router — most fibre routers have a toggle for this in their settings, or you can ask your ISP to set it to bridge mode so it simply passes the internet through without running a network of its own. Any old booster or repeater still plugged in for "just the guest room" needs to come out entirely, not just be switched off at the wall, because a device left half-connected can still cause trouble. If you keep a portable modem for load shedding or travel, leave it powered down while you're home on Plume, rather than letting it sit on standby in the same house as your main network. And once the household is down to one network, go into your phones and laptops and forget the old saved networks rather than leaving them ranked in the background — a "known" network can get picked again months later the moment it reappears.
None of this takes long, and it's usually a fifteen-minute job once you know what you're looking for. But it's the difference between a mesh system that's actually managing your whole home and one that's only managing the parts of it your devices bother to ask it for.
If you're not sure what's still broadcasting in your house, or you want help tracking down an old router or booster that's quietly working against your Plume system, get in touch. It's a quick thing to check, and it solves more "my Wi-Fi is down" calls than almost anything else we look at.