If the internet is slow on one phone or laptop but works normally on other devices connected to the same Wi-Fi network, start by checking the affected device rather than immediately blaming your internet provider.
A weak Wi-Fi connection, background downloads, VPN settings, outdated software or a problem with the device’s wireless adapter could be responsible. However, some router issues can also affect only one device.
The most useful first step is to compare two devices under similar conditions. That can help you work out whether to focus on your phone or computer, your Wi-Fi network, or the internet connection itself.
Why Is the Internet Slow on Only One Device?
Two devices connected to the same router do not necessarily receive identical internet performance.
For example, your laptop might connect to a crowded 2.4 GHz Wi-Fi band while your phone uses 5 GHz. Your laptop may also be downloading updates, running a VPN or experiencing problems with its wireless driver.
A slower result on one device can be caused by:
- Weak Wi-Fi reception or wireless interference
- Background downloads, cloud backups or software updates
- An overloaded browser or application
- VPN, proxy or device-specific network settings
- An outdated or malfunctioning Wi-Fi adapter
- Router compatibility or device-specific connection problems
The important distinction is whether the slowdown follows one particular device or affects several devices on the network.
First, Compare Your Internet Speed on Two Devices
Before changing network settings, run a simple comparison.
Test the affected device. Connect it to your usual Wi-Fi network. Pause downloads and streaming, then run an internet speed test. Note the download speed, upload speed and latency if available.
Test another device. Connect a second phone or laptop to the same Wi-Fi network, preferably in the same room. Use the same speed-testing service, with no other major downloads running.
Compare the results. If the second device performs normally but the first remains slow across repeated tests, investigate the first device. If both are slow, examine the router, shared Wi-Fi conditions and internet connection.
Test the devices one at a time. Running both tests simultaneously may cause them to compete for bandwidth.
Remember that a speed test measures performance along a particular route to a test server. It does not directly measure the maximum capacity of your ISP connection.
How to Fix Slow Internet on One Device
1. Restart the Affected Device
A restart is a sensible first step, particularly when the slowdown started recently.
Save your work, restart the phone or computer, reconnect to Wi-Fi and repeat your test. Temporary software or network connection problems may disappear after a restart.
If the issue returns regularly, continue troubleshooting instead of relying on repeated restarts.
2. Check Wi-Fi Signal Strength and Distance
Try using the affected device close to your router.
If the internet becomes noticeably faster, the problem may involve wireless signal strength, interference or the device’s Wi-Fi adapter.
Walls, furniture, neighbouring wireless networks and other electronic devices can affect Wi-Fi performance.
If your router offers both 2.4 GHz and 5 GHz connections, try each supported band. The 5 GHz band can offer better performance in suitable conditions, while 2.4 GHz often reaches farther.
Do not assume that changing bands will always solve the problem. Test both and keep the connection that performs more consistently in your environment.
3. Stop Background Downloads and Updates
Your device might be using internet bandwidth without an obvious download window.
Check whether cloud storage, operating-system updates, game downloads, file synchronisation or other applications are transferring data.
Pause unnecessary transfers temporarily and repeat the speed test.
If the connection improves, resume applications individually to identify the source of heavy network usage.
Do not disable important security updates permanently just to make a speed test appear faster.
4. Check VPN and Browser Settings
A VPN changes the route your internet traffic follows. Depending on the VPN server and connection conditions, it may affect speed or responsiveness.
If you use a personal VPN, disconnect it temporarily when appropriate and compare the results.
If the issue happens only in one browser, try another browser or a private browsing window. An extension, browser configuration or individual website may be responsible.
On a workplace or school device, do not bypass an organisation’s required VPN or security controls. Contact its administrator instead.
5. Forget and Reconnect to Your Wi-Fi Network
A device can sometimes retain network settings that interfere with its connection.
If restarting and checking the signal do not help, try forgetting the saved Wi-Fi network and connecting again.
Make sure you know the network password before removing the saved connection.
After reconnecting, check whether the device obtains internet access normally and whether speed or stability improves.
6. Check for Software and Wi-Fi Driver Updates
Outdated operating-system software or wireless drivers may contribute to connectivity problems.
For a Windows computer, check Windows Update and your computer manufacturer’s support resources for a compatible Wi-Fi adapter driver.
For Android phones and iPhones, check for available system updates through the device’s official settings.
Install updates from trusted sources. Avoid unknown driver-download websites or utilities that promise to fix every network problem automatically.
7. Test the Device on Another Network
Connecting the affected device to another trusted Wi-Fi network is one of the more useful ways to narrow down the cause.
If the device works normally on the second network, investigate compatibility, signal conditions or configuration on your original network.
If the same device remains slow on several otherwise healthy networks, a device-level software or hardware problem becomes more likely.
You can also use a phone hotspot for comparison if permitted by your mobile plan. Remember that speed testing and downloading through mobile data may consume your allowance.
Troubleshooting by Device Type
Windows Laptop or Desktop
If only your Windows computer has slow Wi-Fi, start with its built-in network diagnostic tools.
On Windows 11, you can open Settings, go to Network & Internet, and use the available network troubleshooting options.
Check the Wi-Fi connection, test another supported wireless band, inspect background network usage and install appropriate updates.
If necessary, forget the network and reconnect.
A complete network reset should be a last resort. It can remove saved network configuration and may require you to set up VPNs or other networking software again.
Android Phone
If your Android phone is slow but another device works properly, first restart the phone and check its Wi-Fi connection.
Move nearer to the router and compare the connection. If appropriate, briefly switch between Wi-Fi and mobile data to see whether the slowdown is limited to one network.
Check for background downloads and available Android updates.
The exact network settings vary between Samsung, Xiaomi, OPPO, Vivo and other Android devices.
iPhone or iPad
On an iPhone or iPad, open Settings and check that your device is connected to the intended Wi-Fi network.
Try moving closer to the router, restarting the device and checking whether a VPN or other network-related software is affecting connectivity.
If you eventually need to reset network settings, be aware that saved Wi-Fi networks, passwords and certain VPN or cellular settings may be removed.
Use a network reset only after simpler steps fail.
What Your Test Results May Tell You
| Observation | What to investigate |
|---|---|
| One device is consistently slower | Device software, wireless adapter, Wi-Fi band or settings |
| Both devices are slow | Router, wireless congestion or internet service |
| Device improves near router | Signal strength, distance or interference |
| Device works well on another network | Original network configuration or compatibility |
| One application is slow but others work | Application, server, browser or VPN-related problem |
These results provide diagnostic clues, not definitive proof. Changing only one factor at a time makes it easier to understand what helped.
Is It a PTCL Problem or a Device Problem?
If you use PTCL DSL, PTCL Flash Fiber or another broadband provider in Pakistan, the same initial comparison applies.
When several devices experience a slowdown, an ISP-related issue becomes more plausible. But shared Wi-Fi interference, a busy router or background traffic can produce similar symptoms.
If only one device struggles, check that device and its connection to the router before requesting a line repair or upgrading your internet package.
For persistent problems, record the affected device, connection type, approximate times, and results from comparable tests. These details can help your ISP or device technician investigate the issue.
When Should You Contact Support?
Contact your internet provider when multiple devices have poor connectivity, the router reports a service fault, or the issue continues after reasonable network checks.
Contact your device manufacturer or a qualified technician when the same phone or computer repeatedly performs poorly on different working Wi-Fi networks, particularly if its wireless adapter is missing, disconnecting or failing to detect networks.
Avoid changing advanced router settings, disabling Wi-Fi security or performing factory resets without understanding their consequences.
The next useful action is to identify where the problem occurs consistently. Compare two devices, repeat the test after one change, and use the results to decide whether to investigate the device, router or ISP.