Three WiFi Calling Setup

Step	Action	What It Fixes
1	Check Three network status	Confirms if issue is network-wide
2	Toggle aeroplane mode on/off	Re-registers SIM on Three network
3	Restart your phone	Clears temporary network errors
4	Check Three APN settings	Fixes incorrect data configuration
5	Re-insert SIM card	Fixes poor SIM contact issues
6	Contact Three support	Resolves account or SIM faults

This guide covers everything you need to know about three wifi calling setup on the Three network, including setup steps, troubleshooting tips and useful codes.

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Troubleshooting checklist

WiFi Calling picks up the slack when mobile coverage is weak, routing calls over your internet connection

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

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Enable Wi-Fi Calling for better indoor coverage

iPhone: Settings → Mobile Data → Wi-Fi Calling → On
Android (Samsung): Settings → Connections → Mobile Networks → Wi-Fi Calling → On
No extra charge — uses your existing call and text allowance. Ideal where indoor mobile signal is weak.

Setting up on Three (Three WiFi Calling Setup)

Most call and voicemail features on Three are configured directly through your phone settings or by dialling short codes. Visit the Three APN hub for the latest codes and instructions specific to your plan.

Useful Three codes (Three WiFi Calling Setup)

These GSM short codes for forwarding and voicemail work the same way across UK networks:

Divert all calls: Dial **21*[number]# and press call.

Divert when busy: Dial **67*[number]# and press call.

Divert when no answer: Dial **61*[number]# and press call.

Cancel all diversions: Dial ##002# and press call.

Check voicemail: Hold down the 1 key or dial your voicemail number.

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Fastest way to apply new APN settings

After saving, turn aeroplane mode ON for 10 seconds, then turn it OFF. This forces an immediate network re-registration — quicker than a full restart and equally effective.

Troubleshooting (Three WiFi Calling Setup)

If calls are not working correctly on Three, toggle aeroplane mode on and off, restart your phone, and check that you have adequate signal. For persistent problems, visit the Three APN hub .

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Troubleshooting checklist

The first two steps get most Three connections working

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

What is WiFi calling on Three?

WiFi calling lets you make and receive phone calls and texts over a WiFi connection instead of the mobile network. This is useful when you have weak or no mobile signal but have access to a WiFi network — at home, in the office or abroad. Calls made over WiFi use your existing minutes and texts allowance on your plan.

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Troubleshooting checklist

When Three signal is weak, WiFi Calling routes calls over broadband instead

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

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Enable Wi-Fi Calling for better indoor coverage

How to enable Three WiFi calling on iPhone

Go to Settings → Phone → WiFi Calling and toggle WiFi Calling on This iPhone on. You may be asked to confirm your emergency address. Once enabled, your iPhone will automatically switch to WiFi calling when mobile signal is poor. A WiFi icon appears next to the carrier name in the status bar when WiFi calling is active.

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Troubleshooting checklist

WiFi Calling takes over on poor coverage, sending calls via your internet connection

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

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Enable Wi-Fi Calling for better indoor coverage

How to enable Three WiFi calling on Android

On most Android devices, go to Settings → Network & Internet → Mobile Network → WiFi Calling and toggle it on. On Samsung Galaxy, go to Settings → Connections → Mobile Networks → WiFi Calling. On Google Pixel, go to Settings → Network & Internet → Calls & SMS → WiFi Calling.

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Troubleshooting checklist

Weak mobile coverage? WiFi Calling shifts calls onto your broadband

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

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Enable Wi-Fi Calling for better indoor coverage

Three WiFi calling requirements

Your network plan must support WiFi calling (most modern UK plans do). Your device must support WiFi calling. You must be connected to a WiFi network. On iPhone, you may need to update your carrier settings — go to Settings → General → About and accept any carrier update prompt.

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Troubleshooting checklist

With patchy Three signal, calls travel over WiFi instead

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

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Enable Wi-Fi Calling for better indoor coverage

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Fastest way to apply new APN settings

After saving, turn aeroplane mode ON for 10 seconds, then turn it OFF. This forces an immediate network re-registration — quicker than a full restart and equally effective.

Troubleshooting Three WiFi calling not working

Option greyed out: Your device or plan may not support WiFi calling. Contact your network to confirm it is enabled on your account.

Calls dropping when switching between WiFi and mobile: This is normal during handover. Stay connected to WiFi or mobile to avoid dropped calls during handoff.

Poor call quality on WiFi: Move closer to your router. Check your broadband speed — WiFi calling requires at least 1Mbps upload. Try restarting your router.

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Troubleshooting checklist

Nearly all Three cases resolve in the opening steps

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

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Enable Wi-Fi Calling for better indoor coverage

Frequently Asked Questions About Three WiFi Calling Setup

How do I contact Three UK support?

You can contact Three UK customer support through their official website, via live chat, by phone, or through their social media channels.

How do I check my Three signal strength?

Check your phone's signal bars in the status bar. For a detailed reading, go to Settings → About Phone → Status (Android) or dial *3001#12345#* (iPhone) to open Field Test mode.

What should I do if Three has no service?

If Three shows no service, try toggling Aeroplane Mode on and off, restarting your phone, and checking the Three coverage map for your area. If the issue persists, contact Three support.

How do I keep my number when switching to Three?

To keep your number when switching to Three, request a PAC code from your current provider by texting 'PAC' to 65075. You can then give this code to Three when you set up your new account.

Does Three support WiFi calling?

Many Three plans support WiFi calling. Check your Three account settings or the Three website to see if WiFi calling is available on your plan and how to enable it.

Three WiFi Calling Setup