Which UK Mobile Networks Offer the Best Spam Call Protection?

At the moment, O2 offers the strongest free spam-call protection among the UK’s major mobile networks. 

Its Call Defence service automatically checks incoming numbers and warns eligible customers when a call looks suspicious. EE and Vodafone offer broader security packages with real-time scam-call detection, but both charge a monthly fee. Three provides scam reporting and safety advice, although it does not currently promote an equivalent automatic call-labelling service. 

That makes O2 the easiest recommendation for someone who simply wants their phone to say, “Maybe don’t answer this one,” without adding another subscription to the monthly bill. 

The call that looked completely genuine 

Priya received a call from what appeared to be her bank’s official number. 

The caller knew her name, sounded calm and claimed that someone had tried to access her account. Nothing about the conversation felt like the usual badly scripted scam. 

Then he asked her to read out a security code. 

Priya hung up and rang the bank using the number printed on her card. The original call had been fake. 

The scammer had spoofed the caller ID, making another number appear on her screen. Even a familiar-looking number cannot be treated as proof that the caller is genuine. O2 specifically warns that criminals can clone the numbers of organisations they want to impersonate. 

Spam protection helps. A healthy bit of suspicion still earns its keep. 

The main networks compared 

O2: the best free option 

O2’s Call Defence analyses incoming numbers and labels calls that may be spam or scams. 

Brand ID works alongside it by displaying the verified names of participating businesses. That helps customers tell the difference between a genuine company and somebody in a bedroom claiming to be from “the fraud department”. 

The services are switched on automatically at no extra cost for eligible Pay Monthly, SIM-only and business customers. iPhone users need iOS 18 for the labelling to appear. 

Call Defence warns rather than automatically rejecting every suspicious call. That is sensible because an overenthusiastic filter blocking the dentist, delivery driver and GP would soon become its own nuisance. 

EE: stronger protection, but you pay for it 

EE’s Scam Guard is a £2 monthly add-on for Pay Monthly customers. 

It monitors incoming calls in real time, warns about suspected nuisance calls and can block calls identified as spam or fraud. Because the system is built into the EE network, it can examine calling behaviour rather than relying only on a list stored inside an app. 

The package also includes wider digital-security features, such as identity monitoring and tools for checking suspicious links or messages. 

It is more comprehensive than basic call labelling. Whether it is worth paying for depends on whether you will use the extra protection rather than forgetting it exists after the first bill. 

Vodafone: a close paid alternative 

Vodafone added AI-powered Scam Call Protection to Secure Net Mobile in April 2026. 

The feature analyses incoming calls and displays warnings for known or suspected scam and nuisance numbers. Secure Net Mobile also includes online-threat protection, malware tools and identity monitoring. It costs £2 per month, with a three-month trial available to eligible Pay Monthly customers. 

Vodafone and EE are therefore fairly close. 

Choose between them based on the wider mobile deal and coverage rather than spam protection alone. Switching networks to dodge one suspicious call would be a touch dramatic. 

Where Three stands 

Three provides guidance for blocking numbers and asks customers to report nuisance calls by texting CALL, followed by the number, to 7726. 

That reporting is useful because it helps networks investigate and suppress scam activity. However, Three’s public customer guidance currently leans more heavily on reporting and handset-level blocking than on automatic on-screen scam labels. 

Modern iPhones and Android phones have their own spam filtering, so Three customers are not completely left to fend for themselves. The protection is simply less network-led. 

Which network should you choose? 

Choose O2 for the best no-extra-cost option. 

Choose EE or Vodafone when you want scam-call warnings bundled with broader online and identity protection and do not mind paying £2 a month. 

Three covers the basics, but users who receive frequent nuisance calls may find O2’s automatic labels or the paid EE and Vodafone services more reassuring. 

Whichever network you use, report suspicious calls to 7726, never share one-time passcodes and hang up when someone pressures you to act immediately. 

No filter catches everything. 

Sometimes the most effective spam protection is still the red button.