Many households continue to deal with nuisance calls and wonder: can you use more than one call blocker on the same landline? With rising scam attempts across the UK, families want reassurance that their loved ones—especially older relatives—are fully protected. This guide explains whether using multiple devices works, and what alternative setup offers stronger safety.
How Do Call Blockers Work on a UK Landline?
Before deciding whether you can use more than one call blocker on the same landline, it’s helpful to understand how call blockers operate. These devices sit between the phone socket and handset to filter calls.
Most UK call blockers:
- Use large databases of known scam and nuisance numbers.
- Identify withheld or international numbers often linked to scams.
- Provide blacklist and whitelist features for personalised control.
- Screen unfamiliar callers before letting the call through.
- Rely on caller ID to detect whether the number is safe or suspicious.
When two devices attempt to read the caller ID at the same time, the signal can become corrupted, reducing accuracy.
Summary: Call blockers depend on clear caller ID signals, making multiple devices difficult to coordinate.
Is It Safe to Use More Than One Call Blocker on the Same Landline?
While it is physically possible, it is not advisable to use more than one call blocker on the same landline. Two devices competing to analyse incoming calls can create:
- Missed calls
- Call delays
- False positives, blocking safe numbers
- Glitches and freezes
- Unpredictable blocking behaviour
Manufacturers of UK call-blocking devices consistently recommend using only one blocker at a time.
Summary: Two call blockers on one landline cause interference and unreliable results.
What Is the Best Solution for Strong Nuisance Call Protection?
Instead of using multiple devices, UK households can create a more effective protective setup.
The strongest method includes:
- One high-quality call blocker with a comprehensive database.
- Network-level filtering offered by BT Call Protect, Sky Shield, or TalkTalk CallSafe.
- TPS (Telephone Preference Service) registration to reduce legitimate marketing calls.
- Voicemail screening to filter suspicious callers.
- Whitelist features for trusted family members and services.
This combination ensures nuisance calls are filtered at both the network level and household level without technical issues.
Summary: A single call blocker combined with telecom protections provides the safest and most reliable setup.
Conclusion
Using more than one call blocker on the same landline may seem like extra protection, but it leads to device conflicts and unreliable performance. The most effective solution is one high-quality call blocker paired with your provider’s call-filtering tools. Explore our range of call blockers to enhance your home’s safety.
FAQ
Q: Can you use more than one call blocker on the same landline?
A: It’s technically possible but causes device conflicts and is not recommended.
Q: What issues occur with multiple call blockers?
A: Interference, delays, missed calls, and incorrect blocking.
Q: What’s a safer alternative?
A: Use one call blocker plus telecom services like BT Call Protect or Sky Shield.
Q: Is one call blocker effective enough?
A: Yes, a high-quality device blocks thousands of nuisance and scam numbers.
