At-home callers with working broadband
If calls work outdoors but fail indoors, check whether your phone and plan support Wi-Fi calling before replacing equipment. EE and O2 publish provider-specific guidance on compatible devices and setup.
Who this is for
People who need security texts
If you need ordinary SMS for account checks, confirm support on your exact device and plan; Wi-Fi calling does not necessarily mean Wi-Fi texts are supported. O2 says Wi-Fi text messaging is available on selected devices.
Households comparing mobile networks
If you are considering a provider change, compare indoor coverage at your address and test a prospective SIM at home. Ofcom's coverage checker provides postcode-based predictions, not a guarantee of reception inside a particular building.
What to check before choosing
Wi-Fi calling
Consider when: Broadband and Wi-Fi work in the rooms where you need to call.
Trade-off: Calls depend on working Wi-Fi, an eligible device and plan; a call may drop when you leave Wi-Fi range without usable mobile coverage.
Change mobile network
Consider when: Another network's postcode prediction and an at-home trial suggest it may work better in your home.
Trade-off: Coverage predictions may not match reception inside your building, and a contract change can involve exit costs.
Improve home Wi-Fi
Consider when: Your phone and plan support Wi-Fi calling but the connection is weak in the rooms where you call.
Trade-off: Wi-Fi equipment cannot fix an underlying broadband fault or improve mobile reception outdoors.
Provider-supplied indoor unit
Consider when: Your provider confirms that a residential unit is currently available and that you are eligible.
Trade-off: Do not assume an older device or a business offer is available for residential use. O2 says its former 3G Boostboxes stopped working in December 2025 or earlier under its stated inactivity condition.
| Concern | What to check when buying | Who this matters to |
|---|---|---|
| Reliable calls indoors | Check Wi-Fi-calling support for the exact phone and provider, then test a call in the affected room. | If I need my ordinary number to work where mobile reception is weak, I would check that calls work over my home Wi-Fi. Around 29% of consumers put reliable indoor calls first. |
| Security texts | Ask whether the exact device and plan support ordinary SMS over Wi-Fi, then test an SMS indoors. | If I rely on ordinary texts for account or payment checks, I would confirm SMS support rather than assume app messages prove it works. Around 29% of consumers prioritise receiving security texts. |
| Mobile network coverage | Compare indoor postcode predictions, check local service status and test a prospective SIM at home before switching. | If I want mobile service indoors without relying mainly on Wi-Fi, I would compare networks at my address before changing provider. Around 24% of consumers prioritise usable coverage on their chosen network. |
| Home broadband and Wi-Fi | Test broadband separately from room-to-room Wi-Fi; check the connection and router placement before buying extra equipment. | If my home connection is what Wi-Fi calling would depend on, I would check whether broadband works and Wi-Fi reaches the calling room. Around 18% of consumers put dependable home connectivity first. |
Buying pitfalls
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Buying a new handset before diagnosing the problem
A problem limited to one address may relate to local coverage or service conditions rather than the handset itself. Ofcom advises considering whether the fault happens in one location or wherever you use the phone.
Compare indoor and outdoor coverage, check your provider's service status and test the existing phone and SIM before replacing equipment.
An unnecessary handset purchase or provider change may still leave indoor calls unreliable.
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Assuming Wi-Fi calling includes SMS on every device
Support for Wi-Fi calls does not establish that ordinary security texts will work. O2 says Wi-Fi texting is supported on selected devices.
Check with your provider for the exact handset and plan, then test an ordinary SMS indoors.
You could still miss account-verification texts even when voice calls work.
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Treating an old femtocell listing as a current offer
O2 says its former 3G Boostboxes stopped working in December 2025 or earlier under its stated inactivity condition. Business equipment offers do not establish residential eligibility.
Ask your own provider to confirm current residential availability, eligibility and support before considering an indoor unit.
Time spent seeking or buying equipment may not lead to a unit your provider currently supports.
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Buying mesh Wi-Fi to fix a broadband fault
Ofcom explains that in-home Wi-Fi equipment cannot outperform the underlying broadband connection.
Test broadband separately from Wi-Fi, and follow your provider's fault process if the broadband connection is unreliable before buying extra equipment.
Additional equipment may not restore the connection needed for Wi-Fi calling.
Relevant brands and providers
Apple
An iOS handset option; EE publishes Wi-Fi-calling setup guidance for the iPhone 16e running iOS 26.
- EE's guide documents a Wi-Fi-calling setting for that model and software.
- That setup guide does not establish superior indoor mobile reception or support with every UK provider and plan. Check SMS separately with your provider.
Samsung
The Galaxy A16 5G is an Android option with Wi-Fi calling and 4G calling listed in EE's model-specific guidance.
- EE documents a Wi-Fi-calling setup for the Galaxy A16 5G running Android 14.
- The model-specific information should not be assumed to apply to the Galaxy A16 LTE or to every provider and plan combination.
The Pixel 9a is another Android handset option; EE provides model-specific Wi-Fi-calling setup instructions.
- EE documents a setup path for the Pixel 9a running Android 15.
- The guide does not establish a reception advantage, universal plan eligibility or SMS behaviour on every network.
EE
A UK mobile-plan option for customers whose device and connection are compatible with Wi-Fi calling.
- EE says compatible customers can call and text over Wi-Fi, with normal call and text allowances or standard rates applying.
- A call may drop when leaving Wi-Fi range without usable 4G coverage; check service where you use the phone.
O2
O2 describes Wi-Fi calling for compatible devices and eligible Pay Monthly or Pay As You Go plans.
- Its guidance provides a Wi-Fi-calling option for eligible device and plan combinations.
- O2 says Wi-Fi text messaging works only on selected devices. Its former 3G Boostbox is not a current working residential alternative.
Related Joybuy products
These products relate to improving home Wi-Fi for Wi-Fi calling or choosing a handset. For any phone, confirm Wi-Fi-calling and SMS support with your provider for the exact device, SIM and plan before buying.
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NETGEAR Orbi 370 RBE373 WiFi 7 Mesh System, 3-Pack
Consider it only if broadband works but Wi-Fi coverage is weak where you make calls.
Dual-band BE3600; 2.5Gbps Ethernet.
Requires a high-speed internet connection and an existing modem or gateway; mesh Wi-Fi cannot fix an underlying broadband fault.
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Google Pixel 10 Pro 5G Dual Sim, 16GB RAM, 128GB, Obsidian
Consider this handset only after checking Wi-Fi-calling and any required SMS support with your provider for the exact device, SIM and plan.
5G Dual Sim; 16GB RAM; 128GB; Obsidian.
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TP-Link Deco BE22, 3-Pack, BE3600 Whole Home Mesh Wi-Fi 7 System
Consider a mesh system if broadband works but Wi-Fi is weak in the rooms where you need Wi-Fi calling.
3-Pack; BE3600; Wi-Fi 7.
Mesh Wi-Fi depends on a working broadband connection and cannot fix an underlying broadband fault.
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Samsung Galaxy Z Fold 8, Graphite, 256GB
Before choosing this handset for weak indoor reception, check Wi-Fi-calling and any required SMS support with your provider for the exact device, SIM and plan.
Graphite; 256GB.
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nubia Air Pro, White
Check Wi-Fi-calling and any required SMS support with your provider for the exact phone, SIM and plan before choosing a handset for poor indoor reception.
White.
Frequently asked questions
How can I tell poor indoor coverage from a faulty phone or a local outage?
Check whether the problem happens only at home or wherever you use the phone, compare Ofcom's indoor and outdoor coverage predictions and check your provider's service status. If the problem follows you to other places, ask the provider about checking the handset or SIM.
Will Wi-Fi calling deliver ordinary security texts?
Do not assume that it will without checking your device and plan. EE says compatible customers can call and text over Wi-Fi, while O2 says Wi-Fi texting is supported on selected devices; confirm support with your provider and test an ordinary SMS indoors.
What should I do if Wi-Fi calls fail in one room?
Check whether broadband itself is working before buying Wi-Fi equipment. If broadband works but Wi-Fi is weak in that room, check router placement and coverage; if broadband is unreliable, follow your provider's fault process first.
Should I rely on a provider-supplied femtocell?
Only consider one after your own provider confirms current residential availability, eligibility and support for your service. O2 says its former 3G Boostboxes stopped working in December 2025 or earlier under its stated inactivity condition, so an old help page is not confirmation of a current offer.
Can I buy any advertised mobile signal booster?
No: Ofcom says repeaters that do not meet its technical requirements remain illegal. Do not treat an unverified signal booster as equivalent to a provider-supplied indoor unit; confirm any proposed equipment and residential support with your provider.