The method
Wi-Fi symptoms feel maddening because 'my Wi-Fi is broken' is always a compressed guess covering up to five unrelated causes. The playbook order exists: the first five minutes of checking save the next five hours of random fixes. Work down; the moment a test splits your problem in two, follow only the half that's yours.
- Q1: Which hop is broken — Wi-Fi or the internet?On the troubled device, check the router's admin page shows a live WAN/IP (cable/fiber/DSL status 'online'). Or simplest: another device on the same Wi-Fi working fine = Wi-Fi's fine, the device is yours. All devices dead but router lights normal = reboot the router once, and if still down, it's the ISP — stop optimizing and call them.
- Q2: One device or every device?One device in every location (phone bad at home and at the office) is a device problem: forget & rejoin, restart, 'Reset network settings' (iPhone/Android guides), update the OS. Router-side settings can't fix a broken NIC driver.
- Q3: One location or everywhere?Everywhere-slow but the room with the router is fast = range/obstruction: placement, then band choice, then the mesh/access-point conversation (Optimize guide). Everywhere-slow including next to the router, but fast on Ethernet = the router's Wi-Fi radios or a congested channel: reboot, retest channels with the planner, firmware update, factory reset as the last router-level move.
- Q4: Constantly bad, or randomly bad?Random blinks and lag spikes (calls freezing, games rubber-banding) point at interference or channel churn: is 2.4 GHz full of neighbors? Is the auto-channel hunting every hour (some routers do; pin it manually)? Near an airport/weather radar on a DFS channel? Microwave, baby monitor, or a neighbor actively mining the building's 2.4 GHz? Constantly bad at the same level is capacity or the line — retest at midnight to feel the difference.
- Q5: What do the numbers say?Now you can measure with a purpose — the speed test below (and the numbers under it). If the signal in the problem room is weak…
Reading the numbers honestly
Android: Settings → Internet → (gear) on your network shows the link speed — the radio's real-time negotiation with the router. iPhone: no link readout, so measure throughput instead (a LAN speed test app against a local server, or a big file transfer to a NAS/PC on the same Wi-Fi is the honest version). Windows: `netsh wlan show interfaces` for both RSSI and link speed — the best free tool most people already own.
| RSSI (signal) | Quality | What to expect |
|---|---|---|
| -50 dBm or closer to 0 | Excellent | Same-room. Top negotiated speed for the device. |
| -50 to -65 | Good | The 'normal' house range. Streaming, calls, and gaming fine. |
| -65 to -75 | Workable, thin ice | Throughput roughly halves per 5 dB past a point; video calls start choosing lower quality. |
| -75 to -85 | Technically connected | Heavy packet loss and lag; anything latency-sensitive is a coin flip. |
| below -85 | Disconnected-in-all-but-name | You will see bars; you shouldn't trust them. This is the number that ends debates. |
The other number is link speed vs. real throughput. A 1200 Mbps link rating moving a 300 Mbps internet plan at full tilt is a healthy network — radio ratings are shared, half-duplex best-cases. Judge Wi-Fi against the same device at the same spot over time, not against the number on the box. And for anything time-sensitive, the latency and jitter at the far point matters more than the download number: a 15 ms ping is a good network at any bar count; 200 ms under load is a bad one at full bars.
The dead-zone decision
Once you know the far room simply has weak signal, stop tuning — the physics is done answering. The ladder from cheapest to best: (1) relocate the router / reorient antennas and verify with readings; (2) move use closer, add a chair, change who sits where (free, underrated); (3) run a cable to that room, or reuse the old router as an access point (see the Upgrade guide); (4) a mesh node, ideally with a wireless 6 GHz backhaul or wired to the modem; (5) powerline (G.hn AV devices have matured — decent on a single-phase house with real sockets, not the extension-lead hell), or MoCA if you have coax; (6) extenders only if literally nothing else can physically happen, and expect half. The only permanent fix is more access points; everything else is negotiation with the medium.
Router-level last resorts
- Factory reset and set up fresh — config drift and half-applied updates fix more than they should. Re-enter the same SSID+password and devices rejoin untouched.
- Firmware reinstall or downgrade if this release correlates with the problem's start — a known-bad update is common enough that vendors keep old ones posted.
- Try another radio's auto-channel (both bands) manually rather than trusting the picker after a big neighbor shift.
- A USB Wi-Fi adapter or new phone as an experiment — isolating 'is it the device's radio?' sometimes saves buying a whole mesh kit for one laptop.
- If the device is old and the answers are mixed: 802.11n-only client + a 2026 router is allowed to be awkward (old WPA quirk, old roaming logic). The honest fix may be that one device's 2.4 GHz-only life is the problem.
Questions people actually ask
I've done every setting change and nothing works. Now what?
At this point the evidence points to hardware or the medium: a failing router radio (rebooting often more than usual, hot to the dead-touch, 2.4 GHz mysteriously useless while 5 works), a damaged coax/fiber drop upstream, or a neighborhood that has changed entirely. Borrow or buy a cheap known-good replacement router to A/B for a day — the one-variable test no setting menu can do.
Does my neighbor's Wi-Fi really slow mine?
Yes, measurably — Wi-Fi is shared spectrum and CSMA etiquette means your router literally waits out busy air. On 2.4 GHz in a dense building, a crowded channel is often the entire story. 5/6 GHz are where a modern router earns their space.
The internet died but the Wi-Fi stayed 'connected' — which box is at fault?
The router usually keeps broadcasting while its WAN is down, so 'connected, no internet' is accurate and not a lie: start at the ISP status, then the cable/fiber handoff, then reboot modem + router in that order.
Verified sources & further reading
External links below were live-checked in September 2026. They back up the specific claims on this page; open them and judge for yourself.