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Three Data Not Working iPhone

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Three data down? Step-by-step fixes covering outages, APN resets and settings on Android and iPhone.

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Why Three data stops working on iPhone

Step Action What It Fixes
1Check Three network statusConfirms if issue is network-wide
2Toggle aeroplane mode on/offRe-registers SIM on Three network
3Restart your phoneClears temporary network errors
4Check Three APN settingsFixes incorrect data configuration
5Re-insert SIM cardFixes poor SIM contact issues
6Contact Three supportResolves account or SIM faults

Three data, calls or texts can drop for a few recurring reasons — a wrong APN, a local outage, a SIM needing reseating, or a device software fault.

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Troubleshooting checklist

Work down this Three list in order — the answer is usually near the top

Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data

Checking Three APN settings on iPhone

Check the Three hub or Downdetector for a known outage before touching settings — during an outage no change helps.

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Troubleshooting checklist

These Three steps run quickest-first, so begin at the top

Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data

Resetting network settings on iPhone for Three

Swipe down, tap Aeroplane Mode on, wait ten seconds, then off. This forces a fresh link to the nearest Three mast, clearing most temporary faults.

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Troubleshooting checklist

Go through them in sequence; the Three fix is normally early on

Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data

Still no data on iPhone — contacting Three support

Hold power and choose Restart — a full reboot clears the modem cache and re-registers the SIM with Three.

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Troubleshooting checklist

Start at the top of this Three list and work down

Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data

Step 4 — Re-seat the SIM on Three on iPhone

Switch the phone off, eject the SIM tray, and check the gold contacts for dirt or corrosion — wipe gently, then reseat firmly and power up.

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Troubleshooting checklist

The Three fix is usually in the first few entries below

Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data

Step 5 — Check Three's APN settings on iPhone

A wrong APN often stops data despite full signal. Check Settings → Mobile Network → Access Point Names against Three's recommended values.

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Troubleshooting checklist

Take these Three steps in order, easiest first

Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data
!
Reset Network Settings will delete all saved Wi-Fi passwords
This step also removes all Bluetooth pairings and VPN profiles. Make a note of your Wi-Fi passwords before continuing. Only use this as a last resort after all other steps have failed.

Step 6 — Reset Three's network settings on iPhone

Android: Settings → General Management → Reset → Reset Network Settings restores Three's default APN and clears Wi-Fi/Bluetooth, leaving apps intact.

iPhone: Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings — the phone restarts on Three defaults.

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Troubleshooting checklist

Begin at step one — Three fixes are ordered quickest-first

Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data

Step 7 — Contact Three support on iPhone

Still stuck? Three support is next — an account issue, failing SIM, or local fault. Have your account number and IMEI (dial *#06#) ready.

Related guides

Three APN Settings Not WorkingHow to Reset Three APN SettingsThree APN Settings Not WorkingThree APN SettingsThree MMS SettingsThree eSIM SetupThree APN Settings for RoamingThree 5G APN Settings
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Troubleshooting checklist

This Three list runs simple to thorough, so start at the top

Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data

📚 Related Three Guides

Frequently Asked Questions About Three Data Not Working iPhone

Why is Three mobile data not working?
Three mobile data may stop working due to an incorrect APN, a temporary network outage, an expired data plan, or a SIM issue. Follow the steps in this guide to identify and fix the cause.
How do I reset my Three APN settings?
On Android: go to Settings → Network → Mobile Networks → Access Point Names, then tap the menu and select 'Reset to default'. On iPhone: go to Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings.
Does Three have a network outage in my area?
Check the Three website or their social media channels for real-time outage information. You can also check third-party sites like Downdetector for user-reported Three outages.
Why does Three show signal but no internet?
If Three shows signal but no internet, the APN settings may be incorrect or missing. Check the APN settings on your device and compare them to the correct Three values in our APN guide.
How long does a Three outage usually last?
Most Three network outages are resolved within a few hours. For planned maintenance, Three usually notifies customers in advance. Check the Three status page for current updates.