What is the difference between WiFi 2.4G and 5G? Which phone connects faster? I walked around the house to test it, and the answer was different from what I expected

the day I built the PC, my technician left me two WiFi names: one called shunuot and the other shunuot_5G. I asked him which phone he connected to, and he said whatever it was. That two words, "whatever," made my sofa corner freeze with video clips for half a year—my phone was stuck to the name with _5G, signal was down to just one bar, and everything kept spinning. When I switched to the one next to me without a suffix, it actually worked smoothly.

clear up a misconception: the 5G on routers is 5GHz band and has nothing to do with the 5G network on mobile data plans. They don't even have tariffs together—one goes broadband, the other uses base stations, but their names clash. Similarly, 2.4G is also a frequency band, 2.4GHz.

first clarify the differences between 2.4G and 5G. There are five key points

these two are not about "replacing the old with the new version"; they are two completely different paths, each with its own way of living.

frequencies are different, so are the fates. 2. 4G has low frequencies and long wavelengths, strong diffraction capability, and attenuates slowly when passing through walls, so it can travel far; 5G has high frequencies and short wavelengths, going straight without turning back; a single load-bearing wall can cut down a large section. Huawei's white paper includes a figure: a 5G signal passing vertically through a concrete wall can attenuate to around 90dB, and after passing through, the signal goes from "good" to "barely acceptable."

the opposite in terms of velocity. The 2.4G band is too narrow, with only a little space in total. WiFi 6 at 2.4G with 2x2 antennas is at most 574Mbps; 5G bands are much wider. For the same WiFi6 2x2, 80MHz bandwidth is 1201Mbps, and 160MHz is directly 2402Mbps—a fourfold difference. You can check out what bandwidth is I wrote about bandwidth before.

there's an invisible difference: interference. The 2.4G road is packed with people—microwaves, Bluetooth headsets, wireless mice, and neighbors' WiFi—all packed into 2.4G; domestically, there are nominally 13 channels for 2.4G, but only 1, 6, and 11 don't overlap, with more than a dozen households competing for three channels per floor. The 5G side has many more channels and don't overlap with each other—you can pick any 149, 153, 157, or 161, and it's very quiet.

I hugged my phone and walked around the house. Comparing the actual data to this

just makes sense, but I took gigabit broadband and added AX3000T, testing three times at each of the four points and two frequency bands to take the average:

staring at the line in the master bedroom: the 5G signal is still there, but the speed has already been surpassed by 2.4G. This is the most frustrating aspect of 5G— the phone's signal icon still has two bars, the actual speed has long since crashed. The phone won't tell you this; it only shows the number of bars, with each grid marked too thickly, covering the cliff from 620 trillion to 170 trillion.

reason is simple: WiFi is two-way calling, the router calls loudly, and the phone calls back also have to pass through that load-bearing wall. The link speed is calculated by the worst end between the two ends; no matter how loud your voice is, it's useless.

the kitchen I encountered another incident: halfway through testing, my mom turned on the microwave to heat food, and the 2.4G speed dropped instantly from 150MB to around 30MB, while 5G didn't budge at all. This is the exclusive weakness of 2.4G—microwaves operate at around 2.4GHz, and once you turn on the microwave, the entire frequency band shakes. Bluetooth earphones also suffer from 2.4G, but their power is lower and not as exaggerated. If I hadn't seen the numbers jump with my own eyes, I wouldn't believe a hot rice appliance could be so powerful.

every device at home should have been fixed to the frequency band long ago

After testing, I assigned seats to all the devices at home. The rule is: don't be polite if you can get 5G, but don't force yourself if you only have 2.4G.

try to stick to 5G: phones, laptops, tablets, TV boxes, projectors. These are either followed by people (who spend most of their time in areas with good signal) or are fixed in the living room. 5G high-speed feeding is the best value for them. Especially TV boxes—4K live streaming bitrates often reach 20 to 30 Mbps, which doesn't look high, but 2.4G during the evening rush hour when neighbors gather can only reach 50 to 60 Mbps. Plus, the box's own weak antenna makes the buffer coil less funny.

must be nailed to 2.4G cameras: cameras, robot vacuums, smart sockets, smart bulbs, speakers. These devices only have 2.4G hardware; if you give them the 5G password, they won't even find it in the list. This isn't a flaw—it's a cost-saving design—a 2.4G single-band chip is several yuan cheaper than a dual-band chip. the article about smart device network failures I wrote the whole story from start to finish.

depends on the situation: gaming consoles and desktops. If there is a network cable, use the network cable—one step in place; Without a network cable, you can connect to 5G near the router and 2.4G over a wall. Gaming is sensitive to latency, and weak 5G signals tend to cause issues.

dual-band integration, why does it always help you guess wrong

Nowadays, new routers come with "dual-band integration" enabled by default: two bands share one name, and the router decides which side your phone connects to. Listening to intelligence, the real pitfall is the word "for you."

my old phone is a typical example: when you walk from the living room to the master bedroom, the signal drops from -45 to -72, but the phone still sticks to 5G and won't let go. It's not that the router doesn't want to switch, but that switching cuts out for a fraction of a second. The device's strategy is "if you can make do, don't mess around," but the result is holding two bars of 5G and stubbornly holding it, with video stuck to slideshows.

solution: go backend, turn off dual-band integration, split it into two names, and manually connect wherever you go. Human analysis is more reliable than algorithm. the three-step disabling method for Xiaomi routers, the optical modem version is in the Tianyi Gateway article, but the approaches are largely similar across brands. Before

shutting down, let's clarify one thing: which frequency band is currently connected to your phone? For Android phones entering WiFi, the "connection frequency" or "frequency band" line is clearly written: 2400MHz is 2.4G, 5100MHz is 5G; Apple phones are stingy, refusing to display and can only distinguish by name—this is why I advise you to add suffixes to 5G when naming them. If you don't add suffixes, Apple users will always be confused.

By the way, WiFi7's MLO technology is designed precisely for this pain point: the phone connects two bands simultaneously, and the weaker ones automatically cover the bottom, so there's no need to guess. But the premise is that dual-band integration must be enabled, and all phone routers must support WiFi 7. I tested it for a week , and the fastest scenario was the internal network file transfer option.

three pitfalls from connecting to the wrong frequency bands are even worse than having no network

Pitfall One: Smart devices get stuck on 5G networks. most common in households where dual-band integration is left unturned off, the robot vacuum is assigned to 5G by the router when trying to connect to the network, but the chip does not support it, repeatedly reporting network failure to connect. Before network setup, move the device to the router or temporarily turn off dual-band integration; the success rate will immediately increase.

Pitfall 2: Weak 5G signal but forced connection. some phones' WiFi settings have a switch called "Avoid Poor Signal Network," so turn it on; If you don't have this option, go to WiFi details and manually click the 2.4G name—don't be lazy. If the signal is poor and you still can't tune properly, first check out the article on how to fix signal failure then decide whether to switch bands or move the router.

Plot 3: Old devices can't find 5G. Laptops, old printers, and cameras from 2014 years ago never had 5G chips. If they're not on the list, they just don't exist. It's not a fault, so don't mess with the drivers—just screw them to 2.4G and you're done.

Finishing: Arrange the seats for your home WiFi in this order

1. Turn off dual-band integration in the backend and split it into two names: add a _5G suffix after the 5G name, so you can tell what the connection is just by looking at the name;

2. My phone and laptop are connected to 5G by default. When I went deeper into the room and found the card, I manually switched to 2.4G;

3. Cameras and vacuum cleaners are nailed to 2.4G; if the network fails, first consider whether it's a frequency band;

4. If both frequency bands in a room are terrible, that's a coverage issue, not a band issue. Just follow the post about self-checking blind spots hold your phone and walk around—move routers where you should, mesh when you need to.

sum it up in one sentence: 5G is fast, 2.4G is far. Once you realize this, half of your family's 'slow internet users' can't rely on broadband at all.