First find the scope: if every device fails, focus on the router/ISP; if only one device fails, forget and reconnect that network on the affected device.
On Android, menu names vary by maker, so use Settings search when a path in a guide does not match your phone exactly.
Likely causes to check first
- the device has a Wi-Fi link but no usable route to the internet
- saved network credentials or DHCP information are stale
- the router is overloaded or the ISP connection is down
- a VPN, DNS filter or captive portal is interfering
- signal quality is poor even though the network name is visible
The practical troubleshooting sequence
- Check whether another device can use the same Wi-Fi.
- Toggle Wi-Fi off and on, then reconnect to the correct network.
- Forget the network and reconnect if only one device is affected.
- Restart the router if every device is affected.
- Temporarily disable VPN or custom DNS only as a test.
A quick way to narrow it down
If the same Wi-Fi fails on every device, the router or ISP is the common point. If other devices work normally but Android does not, keep troubleshooting on the affected device. If one website fails while others work, the network itself may be fine.
Keep the phone in the same place on the same connection. Test another device before changing the router, SIM or Android network settings.
What not to change first
- Do not factory-reset the phone/PC before checking whether every device is affected.
- Do not keep changing DNS, VPN and router settings at the same time.
- Do not judge Wi-Fi by signal bars alone; internet routing can fail with full signal.
- Avoid pressing the router reset pin unless you know the ISP/router setup details.
What success should look like
Use both a browser and another network-dependent app; a single cached webpage is not enough to prove the connection is healthy.
When to use support or repair
Contact the ISP/router provider if every device loses internet and the modem/router shows a fault state. Contact the device maker only after the same device fails on more than one known-good Wi-Fi network.
Record phone model, Android version, carrier or Wi-Fi band, exact error and whether other devices work. Never share network passwords.
A useful network split test
Test the affected device on a second known-good Wi-Fi network, such as a trusted hotspot. Then test another device on the original Wi-Fi. Those two checks quickly separate device problems from router/ISP problems.
Android-specific disconnect clues
On Android, check whether the phone switches to mobile data when Wi-Fi quality drops, whether battery-saving or adaptive connectivity features are involved, and whether the problem follows one saved network or every Wi-Fi network. If only one router triggers it, test the router band/channel before resetting the phone.
Frequently asked questions
What should I check first for android wi-fi keeps disconnecting? how to fix it?
First find the scope: if every device fails, focus on the router/ISP; if only one device fails, forget and reconnect that network on the affected device.
Should I reset the whole device immediately?
Usually not. Test another device on the same network and this phone on a second network before changing router settings.
How do I know when the fix is real?
Use both a browser and another network-dependent app; a single cached webpage is not enough to prove the connection is healthy.
Official sources and further reading
- Google Android Help — Fix internet connection problems
- Google Pixel Help — Fix Wi-Fi connection problems
First compare the affected phone with another device on the same network, then compare the phone on a second trusted network.