By clicking a retailer link you consent to third party cookies that track your onward journey. If you make a purchase, Which? will receive an affiliate commission which supports our mission to be the UK's consumer champion.

BT3570 single

Phone & answering machine
1 handset

£2,500View retailers

Test score

Lowest available price

£2,500Argos

Sign up to unlock the full expert review

The 3570 is one of BT's cheapest call-blocking phones. It has a bright blue one-touch do not disturb button to silence calls, and you can set up a VIP list and a blacklist to ensure that only approved callers can get through. But how clear are calls, and how easy is it to set up and to use? We sent the phone to our test lab to find out.

pros

Content has been blurred out, please log in to view.

cons

What's included?

What is it?
What's it like to use?
What's the sound quality like?
Is there anything I should watch out for?
Is there anything else I should know?
Should I buy it?

Full Access first month £5, then £10.99 per month, cancel at any time

KEY TEST RESULTS
Sound quality
Ease of use
Phone range

Jan 2024Last checked by Which?
Oct 2016First reviewed by Which?
Jul 2016Released

The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.

How we test cordless phones

5 Mar 2024

Sound quality

Overall
Phone sound quality
Loudspeaker sound quality
Answering machine sound
Ring volume

How we test sound quality

We make a series of calls from each phone while an expert checks the sound quality at both ends of the line. Our experts also listen to calls on the speakerphone and assess the sound quality of incoming and outgoing messages left on the answering machine.

Ease of use

Overall
Phone ease of use
Answering machine use

How we test ease of use

Ergonomic experts assess how easy it is to set up the phone, add contacts to the phone book and make and receive calls. We rate the general handling, including whether the buttons are well spaced and the display easy to read, and also assess how simple it is to operate the answering machine.

Phone range

How we test phone range

We check the range of each cordless phone by measuring the call quality on different floors within our laboratory and through steel and brick walls. We also note whether the phone will you if the signal is getting too weak before cutting out.

Features

How we test features

We check for the presence of useful features such as speed dial keys and a speakerphone as well as looking to see if the phone is hearing aid compatible. For models with an answering machine we also award extra marks to those that have large memories and can store lots of messages.

Call blocking

How we test call blocking

We test each model's capabilities by making calls to it from various types of phone numbers, to verify that the blocking is working as well as it should.

General
Type of device	Phone & answering machine
Number of handsets	1 handset
Phonebook size	50 contacts
Answering machine memory	20 minutes
Location of message indicator	Handset & base
Location of ringer	Handset & base
Handset display size	1.6-inches
Display type	Black & white

Features
Speed dial	Yes
Hearing aid compatible	No
Blocks mobile numbers	No
Blocks international numbers	Yes
Blocks withheld numbers	Yes
Blocks unavailable numbers	Yes

Compare retailers

Prices updated daily

Prices are ordered from lowest to highest, irrespective of retailer rating or stock, and exclude any potential delivery costs. We are not able to show every possible retailer and cheaper prices may be available.

Argos
In Stock£2,500

Suggested Alternatives

VTech

ES2001

Phone only
2 handsets

£30.99View retailers

Test score

BT

5960 Twin

Phone and Answering Machine
2 handsets

£39.99View retailers

Test score

Panasonic

KX-TGB610EB

Phone only
1 handset

£19.95View retailers

Test score

How to block nuisance calls: best calling blocking home phones
Billions of nuisance calls are made to UK consumers every year. In this guide, we’ll explain the different ways you can block them on smartphones and home phones.
How we test cordless phones
Find how we test home phones, what makes a Best Buy cordless phone and why our reliability survey is an important factor as well as our thorough lab tests.
Best cordless phones for 2024
We've found the landline phones that are easy to set up and use, whilst offering crystal-clear calls and great cordless range. Our expert buying guide helps you choose the best cordless phone, pointing out the features you need and revealing how much you should spend.

All cordless phone advice

BT3570 single

Lowest available price