Overview
Connection trouble is usually one of three things: the phone's link to a specific network, the router or accessory, or the phone's network settings. Working through them in order finds the fix fast — and the same logic applies to Wi-Fi, Bluetooth and mobile data, so this guide covers all three together.
Symptoms you might see
- The phone won't join a known Wi-Fi network, or connects with no internet.
- Bluetooth won't pair, or keeps dropping the connection.
- There's no mobile data or signal where there should be.
- A radio toggle is greyed out or won't switch on.
Possible causes
- A temporary glitch on the phone, router or accessory.
- A bad saved network, pairing or incorrect password.
- Router problems or an overloaded network.
- Aeroplane mode, a VPN or a data-saver blocking the connection.
- In rare cases, a radio hardware fault.
Step-by-step troubleshooting
Work through these in order — the earliest steps are the safest and fix the most cases.
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Toggle the radio and aeroplane mode
Turn the relevant radio (Wi-Fi, Bluetooth or mobile data) off and on in quick settings. Then switch aeroplane mode on for ten seconds and off again to reset every wireless connection at once. This clears the most common temporary glitches.
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Restart the phone and the router
Restart the phone. For Wi-Fi, also power-cycle the router by unplugging it for 30 seconds. A stale router causes a surprising number of 'phone' Wi-Fi problems — test another device to confirm where the fault is.
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Forget and rejoin, or re-pair
For Wi-Fi, open the network's details and choose 'Forget', then rejoin and re-enter the password. For Bluetooth, remove (unpair) the accessory and pair it fresh. This fixes a bad saved configuration.
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Check for blockers
Make sure aeroplane mode is off, turn off any VPN temporarily, and disable data-saver or 'low data mode' for the network. Any of these can quietly prevent a proper connection.
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Confirm mobile data settings
For no-signal or no-data issues, check that mobile data is on, that you're not past a data limit, and that the SIM is seated properly — power off, reseat the SIM, and power on. Toggle network mode if your area has patchy coverage.
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Update the phone
Install any pending system update, since connectivity bugs are frequently patched. If Wi-Fi is down, update over mobile data or another network.
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Reset network settings
In Settings, search 'reset' and choose 'Reset Wi-Fi, mobile & Bluetooth'. This clears all saved networks, pairings and VPN/APN settings back to defaults — a reliable fix for stubborn problems. You'll need to rejoin networks and re-pair devices afterward.
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Rule out hardware
If a toggle stays greyed out and unresponsive after a restart, update and network reset, the radio hardware may be at fault. Note your model and symptoms and consult a qualified technician.
Before you go further: back up your device to a cloud backup or a computer whenever possible. Steps that could affect your data are clearly flagged — and for suspected hardware faults, a qualified repair professional is the safest next step.
Prevention tips
- Keep the phone and your router firmware updated.
- Note your Wi-Fi password so you can rejoin after a reset.
- Restart your router periodically to keep it healthy.
- Remove old Bluetooth pairings you no longer use.
- Use the 5 GHz Wi-Fi band when close to the router for a stronger link.
Frequently asked questions
Why does my phone say 'connected, no internet' on Wi-Fi?
The phone joined the network but can't reach the internet — usually a router issue. Restart the router, forget and rejoin the network, and test another device. Reset network settings if it persists.
Why does my Bluetooth keep disconnecting?
Common causes are low accessory battery, interference, or a glitchy pairing. Charge the accessory, unpair and re-pair it, keep it in range, and update the phone. A network-settings reset clears stubborn pairing faults.
What does resetting network settings do?
It returns Wi-Fi, Bluetooth and mobile-data settings to defaults, clearing saved networks, passwords and pairings. It doesn't delete photos or apps, but you'll need to rejoin networks and re-pair devices afterward.
Related guides
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