TL;DR — the answer first
- The coin trick does not work. Experts say there is no scientific backing for putting a coin on a router, and a coin cannot amplify or redirect a WiFi signal.
- The foil trick is not reliable either. One test in October 2026 found mixed results, with a small gain for a nearby device and worse results for devices farther away.
- The real fixes are boring, and that is why they work. Router placement, a restart, a firmware update, less interference, and a cable for the devices that matter most.
- Start with a speed test, not a trick. If you do not measure the problem first, you cannot tell which fix actually helped.
That is the short version. The rest of this article explains why the viral tricks fail, what the test really showed, and the fixes worth your time.
Contents
- TL;DR — the answer first
- The night the movie kept freezing
- What the coin trick claims, and why it fails
- What about the foil trick?
- Why do these tricks spread so fast?
- Step zero: run a speed test first
- Fix one: move the router to a better spot
- Fix two: restart the router, properly
- Fix three: update the firmware
- Fix four: reduce interference and change the channel
- Fix five: use a cable for the devices that matter most
- Fix six: manage devices at peak times
- Fix seven: know when the problem is not inside your home
- The diagnosis checklist, step by step
- Frequently asked questions
- The bottom line
The night the movie kept freezing
Picture a normal evening at home. Someone starts a film, someone else joins a video call, and a third person starts scrolling through videos in the next room. At first everything is fine, and then the film starts to buffer. The picture freezes, the little loading circle spins, and someone shouts the question every household knows by heart.
Why is the WiFi so slow tonight. It is a fair question, and it is also the moment when most people reach for their phone and search for a quick fix. That search is where the trouble starts, because the internet is full of tricks that look clever, cost nothing, and promise an instant improvement. Two of them keep coming back, and both sound just plausible enough to try.
The first is putting a coin on top of your router. The second is putting a sheet of aluminum foil behind it, shaped like a curved reflector. Both have been shared thousands of times, and both come with confident comments from people who swear they work. This article will be honest with you about both of them, and then it will give you the slower, less exciting fixes that actually make a difference.
What the coin trick claims, and why it fails
The coin trick usually goes like this. You place a coin, sometimes several coins, on top of your router, and the claim is that the metal somehow boosts, focuses, or strengthens the signal. Some versions say the coin acts like an antenna, and others say it reflects the signal toward your devices. It sounds technical, and that is part of its appeal, because it borrows words from real radio science without following the science.
Here is the plain truth. Experts say there is no scientific backing for the coin trick, and a coin cannot amplify or redirect a WiFi signal in any useful way. A router antenna is designed and tuned as part of the router, and dropping a random piece of metal on top of it does not turn it into a better antenna. At best, the coin does nothing, and you will not notice any change at all.
At worst, the coin can cause a small real problem. Objects sitting on top of a router can block its ventilation, and routers need airflow to stay cool, especially when they are working hard. A hot router can slow down, drop connections, or restart itself, which is the opposite of what you wanted. So the coin trick is not just useless, it is a small step in the wrong direction, and it is best skipped entirely.
What about the foil trick?
The foil trick is more interesting, because it is not complete nonsense. The idea is to place a curved sheet of aluminum foil behind the router, so the signal that would go backward is reflected forward toward your rooms. In theory, a reflector can shape a radio signal, and that part of the idea comes from real antenna design. The problem is that a crumpled sheet of kitchen foil, stuck behind a router in a real living room, is not a properly designed reflector.
One test published by XDA on October 27, 2026, tried exactly this kind of setup, and the results were mixed rather than impressive. The test found a small improvement for a device close to the router, but worse results for devices farther away, and it also found that foil blocks signal behind the router. That last point matters, because most homes need signal in more than one direction, not just toward one room.
So the foil trick is not a reliable fix, and it can easily make things worse for someone in another room. It is one tester’s results in one home, not universal proof that foil works, and your home, your router, and your walls will all change the outcome. If a trick only helps the device sitting next to the router while hurting the device in the bedroom, it is not a fix. It is a trade-off you did not ask for, and most households should not bother with it.
Why do these tricks spread so fast?
Viral tricks spread because they solve the feeling of the problem, not the problem itself. When your WiFi is slow, you feel helpless, and a trick that takes ten seconds gives you something to do right now. It also gives you a story to share, because telling a friend about a clever hack feels better than telling them you moved your router six inches to the left. Social media rewards the clever story, not the boring one, and that is why the coin keeps coming back.
There is another reason these tricks survive. WiFi speed changes all the time, for reasons that have nothing to do with the trick you just tried. Your neighbour may have stopped streaming, your internet provider may have fixed a fault, or fewer devices may be active than five minutes ago.
If you put a coin on the router at the same moment the network calms down, it is easy to believe the coin did it. That is not dishonesty, it is just how our brains connect two things that happened at the same time.
The way to beat that trap is simple. Measure before you change anything, change one thing at a time, and measure again. That habit turns guessing into diagnosis, and it is the single most useful skill in this whole article. Everything that follows uses that habit, and none of it requires buying anything or believing in magic metal.
Step zero: run a speed test first
Before you move anything or change any setting, run a speed test on the device that is actually struggling. Stand where you normally use that device, run the test, and write down the result. Then run the same test standing next to the router, and write that result down too. The gap between those two numbers tells you more than any viral video ever will.
If the speed next to the router is fine but the speed in your room is poor, the problem is probably coverage, walls, distance, or interference inside your home. If the speed is poor even next to the router, the problem may be your internet plan, your provider, or the router itself, and no trick inside your home will fix that. Either way, you now have a baseline, and every fix after this can be judged against it.
Run the test at the time you normally notice the problem, not just once in the morning when nobody is home. WiFi trouble is often a peak-time problem, when everyone is online at once, and a morning test can hide it completely. Write down the time, the place, and the result, because that little note is what turns frustration into a plan. For phone-specific slowness, our guide on how to speed up a slow phone covers the device side of the same problem.
Fix one: move the router to a better spot
Router placement is the most powerful free fix, and it is also the one people resist most, because the router usually lives wherever the installer left it. That spot is often in a corner, behind a television, inside a cabinet, or on the floor, and all of those are bad for WiFi. Walls, furniture, metal objects, and water all weaken a signal, and a router trapped in a corner is already fighting with one hand tied behind its back.
The better spot is simple to describe. Put the router as central in your home as you can, raised up on a shelf or table rather than on the floor, and out in the open rather than hidden inside furniture. Keep it away from thick walls where possible, and away from large metal objects like fridges and filing cabinets. The goal is a clear path to as many rooms as possible, because every wall between the router and your device costs you speed.
Also keep the router away from other electronics that can interfere with it. Microwaves, cordless phones, baby monitors, and some wireless speakers can all crowd the same airwaves your WiFi uses. You do not need to throw those devices away, but you should not stack them right next to the router. A little distance, even a metre or so, can make a noticeable difference, and it costs nothing to try.
Fix two: restart the router, properly
Restarting the router is the oldest advice in tech support, and it survives because it often helps, at least for a while. Routers run day and night for months, and like any small computer, they can develop glitches, memory problems, or stuck connections over time. A restart clears those temporary problems and gives the router a fresh start, which is why support teams always ask you to try it first.
Do it properly, not just by tapping the power button for one second. Unplug the router from the wall, wait about thirty seconds, and then plug it back in and give it a few minutes to fully start up again. That pause matters, because it lets the router fully power down instead of just flickering off and on. Do not restart it five times in a row in frustration, because that will not help, and it will just leave you waiting longer.
A restart is not a permanent cure, and that is important to say honestly. If your WiFi is slow again within a day or two, the restart was only masking a deeper problem, like poor placement, interference, or a router that is struggling with too many devices. In that case, keep reading, because the next fixes deal with the causes rather than the symptoms. Think of a restart as first aid, useful and quick, but not a substitute for treatment.
Fix three: update the firmware
Firmware is the software that runs inside your router, and it gets updates for the same reasons your phone does. Updates can fix bugs, close security holes, and sometimes improve performance or stability, and an old router running old firmware may be missing all of those improvements. Many people never check for router updates, because the router sits quietly in a corner and nobody thinks of it as a device that needs attention.
Check your router’s admin page or its app for a firmware update option, and follow the maker’s instructions carefully. Do not unplug the router during an update, because interrupting it can damage the device, and do not download firmware from random websites. Use only the official update tool or the maker’s own site, because a fake firmware file is a security risk you do not want. If your router is very old and no updates are available anymore, that itself is useful information.
An unsupported router is a quiet warning sign. It means security fixes have stopped, and it may also mean the hardware is too old to handle modern speeds and many devices at once. You do not need to rush out and buy a replacement on the basis of age alone, but if you have tried every other fix and the router is years out of support, replacement becomes a reasonable next step. Until then, a firmware update is free, safe when done properly, and worth checking before you spend anything.
Fix four: reduce interference and change the channel
WiFi shares the airwaves with your neighbours, and in a flat or a crowded street, that sharing can get noisy. Many routers pick a channel automatically, but they do not always pick well, especially when a dozen nearby networks are all competing. If your speed drops at certain times of day, or in certain rooms, interference from nearby networks could be part of the story, and changing the channel can help.
Most routers let you change the WiFi channel in their settings, and many have an auto setting that scans for a quieter channel when the router restarts. If your router has an auto option, try a restart first and see whether it picks something better. If you want to choose manually, look for a WiFi analyser app that shows which channels are crowded near you, and pick a quieter one. Change one thing, run a speed test, and compare it with your baseline before you change anything else.
This fix has limits, and honesty requires saying so. Channel changes help most when interference is the main problem, and they help least when the real problem is distance, walls, or a slow internet plan. They are also more fiddly than moving the router, so try the simple fixes first. Still, for apartment living and busy neighbourhoods, a quieter channel is a genuine, free improvement, and it is far more reliable than foil.
Fix five: use a cable for the devices that matter most
This is the fix that WiFi enthusiasts sometimes hate to admit, because it feels like giving up on wireless. It is not giving up, it is being practical, because some devices do not need to be wireless at all. A television, a desktop computer, or a games console that never moves can use an Ethernet cable, and a cable gives it a stable, fast connection that does not depend on walls, neighbours, or interference.
A cable also helps everything else on your WiFi, which is the part people forget. Every device you move off WiFi and onto a cable frees up wireless capacity for the phones, tablets, and laptops that genuinely need it. If your household has one device that eats most of the bandwidth, giving that device a cable can lift the whole house. That is a bigger win than any trick, and it is the kind of fix that lasts.
You do not need to wire the whole house to benefit. Start with one cable for the worst offender, usually the television or the main computer, and see how the rest of the network feels. Ethernet cables are cheap, they do not need special skills to plug in, and they work with almost every router. If running a cable across a room is impractical, a powerline adapter or a mesh system may help, but those are paid options, and you should only consider them after the free fixes have been tried.
Fix six: manage devices at peak times
Slow WiFi is often not a signal problem at all, it is a sharing problem. Every phone, tablet, television, speaker, and smart device in your home shares the same internet connection, and at peak times they all want a piece of it at once. A video call, a film stream, a game download, and a cloud backup happening together can overwhelm even a good connection, and the result feels exactly like slow WiFi.
The simplest response is timing. Pause large downloads and cloud backups during video calls or family film time, and let them run overnight instead. Most devices and apps let you schedule updates and backups, and setting that schedule once can prevent the worst clashes. You do not need to police every device, just the big background jobs that nobody notices until they slow everything down.
If your router supports it, look for Quality of Service settings, usually shortened to QoS, which let you prioritise certain kinds of traffic. With QoS, you can tell the router that video calls matter more than background downloads, so calls stay smooth even when something else is downloading. Not every router has useful QoS controls, and the settings vary a lot, so check your router’s guide before changing anything. Used carefully, QoS is a real tool, and unlike a coin, it actually does something.
Fix seven: know when the problem is not inside your home
Sometimes you can do everything right and the WiFi is still slow, and that is when you need to look outside your home. Compare your speed test results with the speed your internet plan promises, because a plan that promises a modest speed cannot deliver a fast one no matter how good your router is. If the speed next to the router is far below your plan, time after time, the problem may sit with your provider, your line, or your modem.
Contact your provider with your test results, the times you tested, and the fact that you tested next to the router as well as in other rooms. That detail matters, because it shows you have already ruled out the simple home causes, and it helps support staff skip the basic script. Ask whether there is a known fault in your area, whether your line has an issue, or whether your plan still fits how your household uses the internet. Keep a note of what they say, because a second call is much easier with the first call’s details in hand.
There is also the wider market to consider. The same AI boom that is driving record chip demand is also putting pressure on the whole gadget market, which we covered in our piece on how the AI chip shortage is pushing up gadget prices. That does not directly slow your WiFi today, but it does mean replacement routers and new devices may cost more than they used to. It is one more reason to squeeze every free fix out of the router you already own before you decide to replace it.
The diagnosis checklist, step by step
Here is the whole approach in order, so you can work through it without guessing. Do one step, test, and only move on if the problem is still there. That order saves time, because it stops you from changing five things at once and never knowing which one helped.
- Step 1: Run a speed test where you normally use the device, and again next to the router. Write both results down.
- Step 2: Move the router to a central, raised, open spot, away from walls, metal objects, microwaves, and cordless phones.
- Step 3: Restart the router properly, by unplugging it for about thirty seconds, then letting it fully start up again.
- Step 4: Check for a firmware update in the router’s app or admin page, and install it only from the maker’s official source.
- Step 5: Try a quieter WiFi channel, or let the router pick one automatically after a restart, then test again.
- Step 6: Connect the heaviest fixed device, like a television or desktop computer, with an Ethernet cable.
- Step 7: Pause large downloads and backups at peak times, and check whether your router offers Quality of Service settings.
- Step 8: Compare your results with your plan’s promised speed, and contact your provider if the speed next to the router is still far below it.
If you reach the end of this list and the problem is still there, you have done something valuable. You have ruled out the common home causes, and you can now talk to your provider, or consider a replacement router or mesh system, with real evidence in hand. That evidence is worth more than any viral trick, because it turns a vague complaint into a specific case.
Frequently asked questions
Does putting a coin on a router speed up WiFi?
No. Experts say there is no scientific backing for the coin trick, and a coin cannot amplify or redirect a WiFi signal. Objects on a router can also block ventilation and make it overheat, so it is best not to put anything on top of it.
Does aluminum foil behind a router work?
Not reliably. One XDA test in October 2026 found mixed results, with a small improvement for a nearby device and worse results for devices farther away. Foil also blocks signal behind the router, so it can help one room while hurting another.
Why is my WiFi slow only in one room?
Distance, walls, and interference are the usual causes, because every wall and obstacle weakens the signal. Try moving the router to a more central spot, testing next to the router for comparison, and checking for interference from nearby electronics.
Should I restart my router every day?
No, a daily restart is not needed, and it will not fix a deeper problem. Restart properly when the connection feels stuck or slow, and if the problem returns within a day or two, work through placement, firmware, interference, and device load instead.
Is Ethernet really faster than WiFi?
For a fixed device, Ethernet is usually more stable than WiFi, because a cable is not affected by walls, neighbours, or interference. It also frees up WiFi capacity for the devices that genuinely need wireless, which can help the whole household.
Will a new router fix slow WiFi?
Sometimes, especially if your current router is very old, unsupported, or struggling with many devices. Try the free fixes first, though, because a new router in a bad spot, on a crowded channel, or on a slow plan will still disappoint.
How do I speed up WiFi on a phone or a PC?
Start with the same diagnosis: test next to the router, move closer if needed, and check whether other devices are slow too. For phone-specific steps, see our guide on how to speed up a slow phone, and for a PC, an Ethernet cable is often the single biggest improvement.
When should I call my internet provider?
Call when the speed next to the router is repeatedly far below your plan’s promised speed, even after a proper restart and a firmware check. Bring your test results and times, because that evidence helps support staff skip the basic checks and look for a line or area fault.
The bottom line
Viral WiFi tricks are tempting because they are fast, free, and fun to share, but neither of the famous ones holds up. A coin cannot boost your signal, and it may block ventilation, while foil gave mixed results in one test and can hurt devices in other rooms. Neither is a reliable fix, and both distract from the changes that actually work.
The real fixes are less exciting, but they are honest. Test first, place the router centrally and in the open, restart it properly, update its firmware, reduce interference, cable the heaviest fixed device, and manage peak-time load. Work through them one at a time, and judge each one against the speed test you ran at the start. That method will not go viral, but it will give you faster, steadier WiFi, and that is a much better result than a coin on a router.
