Short answer: work through the fixes in order of effort. Toggling airplane mode and restarting the router fixes most cases in under a minute. If the phone says "connected, no internet", the problem is almost always the router or the connection beyond it, not your phone.
Start here: the 30-second checks
- Toggle airplane mode on, wait five seconds, off. This rebuilds every radio connection.
- Restart the router. Unplug for 30 seconds. This clears the majority of "connected but no internet" cases.
- Check another device. If your laptop also fails, the phone is innocent — move straight to the router section.
- Move closer. Two walls and a floor will halve a 5 GHz signal.
"Connected, but no internet"
This specific message means the handshake with the router succeeded but traffic is not flowing through. Check in this order:
- Captive portal. Hotel, café and airport networks need a login page. Open any plain HTTP site to force it to appear.
- Upstream outage. Check your provider's status page over mobile data.
- IP conflict. Forget the network on the phone and rejoin so it requests a fresh DHCP lease.
- DNS failure. Pages fail but the connection is fine. Set a manual DNS of 1.1.1.1 or 8.8.8.8 in the network's advanced settings.
Forget and rejoin the network
This is the single most effective phone-side fix, because it discards a stale saved configuration.
Android: Settings → Network & internet → Wi-Fi → tap the network → Forget. Then reconnect and re-enter the password.
iPhone: Settings → Wi-Fi → tap the ⓘ next to the network → Forget This Network. Then reconnect.
Check the band you are on
Most routers broadcast two bands and they behave very differently:
| Band | Speed | Range | Best for |
|---|---|---|---|
| 2.4 GHz | Slower | Long, penetrates walls | Far rooms, garden, older devices |
| 5 GHz | Much faster | Short, blocked by walls | Same room as the router, streaming |
If you are getting a strong signal but poor speed in a distant room, you are probably clinging to a weak 5 GHz signal. If your router uses one name for both bands, split them into separate names so you can pick.
Stop Wi-Fi dropping when the screen is off
Android's battery optimisation suspends network activity aggressively. Two settings usually cause it:
- Wi-Fi sleep policy — Settings → Network & internet → Wi-Fi → Wi-Fi preferences. Set it to stay on during sleep.
- Adaptive connectivity / smart network switch — this hands you to mobile data the moment Wi-Fi dips. Turn it off if you are burning mobile data at home.
Last resort: reset network settings
This clears every saved Wi-Fi password, VPN and Bluetooth pairing on the device. Have your passwords ready first.
- Android: Settings → System → Reset options → Reset Wi-Fi, mobile & Bluetooth
- iPhone: Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings
When it is the router, not the phone
Go to the router if you see: every device slow, the connection dropping on a schedule, or speeds far below what you pay for. Worth checking there — firmware updates, channel congestion (scan for a quieter channel), and how many devices are connected at once.
A Wi-Fi manager app shows signal strength in dBm, the channel each nearby network occupies and which devices are on yours, which turns the channel-congestion question from guesswork into a reading.
Signal strength, in plain numbers
| dBm | Quality | What you'll notice |
|---|---|---|
| −30 to −50 | Excellent | Full speed |
| −50 to −60 | Good | Streams fine |
| −60 to −70 | Fair | Video may buffer |
| −70 to −80 | Weak | Drops, slow pages |
| Below −80 | Unusable | Constant reconnects |
Anything worse than −70 dBm in a room you use regularly is a coverage problem, not a settings problem. Move the router, add a mesh node, or switch that room to 2.4 GHz.
