Analyze Wi‑Fi and choose a better channel on Android

A slow or unstable Wi‑Fi is often not the router’s fault but the neighbours’: too many networks on the same channel. NetBlade’s WiFi tab shows what is on the air around you and suggests the least busy channel. This article walks you through reading the analyzer, applying the advice on your router and checking that it helped.

Before you start

Wi‑Fi turned on and, ideally, the phone connected to the network you want to improve, so NetBlade can compare your channel with the others.
The location permission, and on Android 13 or later “Nearby Wi‑Fi devices”. Android requires them to list nearby networks.
Access to your router’s admin page, because the channel is changed there, not in the app.
The WiFi analyzer is free.

1. Scan the air

Open the “WiFi” tab.
Tap “Scan”. The first time, grant the permission Android asks for.
Stand where you normally use Wi‑Fi. The picture near the router is not the picture in the far bedroom.

The list shows each network with its SSID (or “Hidden network”), signal in dBm, channel, band (2.4, 5 or 6 GHz), channel width and security. Your own network is marked as connected.

Tip: Signal in dBm is negative: -45 is strong, -70 is usable, -85 is weak. A neighbour at -85 bothers you much less than one at -55 on the same channel.

2. Read the channel charts

Below the list, “Channel usage” draws each network as a curve over the channels it occupies, one chart per band. Two things to look for:

Overlap. On 2.4 GHz a 20 MHz network spreads over about five channel numbers. That is why only channels 1, 6 and 11 do not overlap each other.
Width. On 5 GHz a network using 80 MHz occupies four 20 MHz slots at once. A single wide neighbour can crowd more spectrum than several narrow ones.

3. Read the channel recommendation

The “Channel recommendation” card gives one line per band where it has something useful to say:

“Channel X — already optimal”: stay where you are.
“Channel X → switch to Y”: you are on X, and Y is meaningfully quieter.
“Least busy: channel Y”: shown for a band where the phone is not connected, so there is no current channel to compare.

How it decides: every neighbour counts for how much of each candidate channel it overlaps, weighted by how loudly you hear it. NetBlade only suggests a move when the quieter channel is clearly better than yours, so it does not send you chasing small differences.

The candidates are the ones a router can use without restrictions:

2.4 GHz: channels 1, 6 and 11.
5 GHz: channels 36, 40, 44, 48, 149, 153, 157 and 161.

Note: A band needs at least two networks before the card says anything about it. The recommendation covers 2.4 and 5 GHz; 6 GHz networks appear in the list but not in the charts or the advice.

4. Save the “before” picture

Tap “Save” to keep the scan. If you granted location, NetBlade also records where you ran it, which helps when you compare rooms or offices later. Saved scans are in the clock icon, “History”.

5. Change the channel on your router

NetBlade does not change router settings; you do it in the router’s admin page. “Tools” → “Router / Gateway” → “Open web interface” takes you there in one tap.

In general terms, on most routers:

Sign in to the admin page.
Find the wireless settings, often under “Wireless”, “Wi‑Fi” or “WLAN”, with separate sections for 2.4 GHz and 5 GHz.
Change the channel from “Auto” to the one NetBlade suggested.
Save and wait for the router to restart the radio. Devices reconnect on their own within a minute.

Warning: If your router uses “Smart Connect” or band steering with a single name for both bands, it may hide the per-band channel setting until you turn that feature off. Check your router’s manual before changing it.

Tip: If most of your devices support 5 GHz, moving them there often helps more than any 2.4 GHz channel change: 5 GHz has many more non-overlapping channels.

Check that it worked

Wait a few minutes, then scan again in the “WiFi” tab. The card should now say “already optimal” for that band.
Open “History” and compare with the scan you saved earlier.
Measure room by room with “Tools” → “Wi-Fi coverage”: type a room name, tap “Measure”, move to the next room and repeat. It records the signal, from “Weak” to “Excellent”, the SSID and the band.
For a before-and-after number, run “Tools” → “Speed test” in the same spot before and after the change.

If something goes wrong

“Permission required” or an empty list. Grant location and, on Android 13+, “Nearby Wi‑Fi devices”. Make sure Wi‑Fi is on.
No recommendation card. There are fewer than two networks in that band, so there is nothing to compare. That is good news.
The recommendation changes from scan to scan. Neighbours change too, and your position matters. Take two or three scans in the rooms that matter and pick the channel that comes up most often.
The router moves back by itself. Its channel is still on “Auto”. Set it explicitly.
Still slow on a quiet channel. Congestion is not the only cause. Check the signal with “Wi-Fi coverage”: a weak signal in a far room is a placement problem, not a channel problem.

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