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British Telecom Synergy 4500

British Telecom Synergy 4500
alaScore 65

18 reviews

May, 2018

alaTest has collected and analyzed 18 reviews of British Telecom Synergy 4500. The average rating for this product is 1.6/5, compared to an average rating of 4.0/5 for other Cordless Phones for all reviews.

We analyzed user and expert ratings, product age and more factors. Compared to other Cordless Phones the British Telecom Synergy 4500 is awarded an overall alaScore™ of 65/100 = Good quality.

Review analysis

(Based on 18 reviews)

User Reviews  


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Consumer review ( review summary for British Telecom Synergy 4500


alaTest has collected and analyzed 18 user reviews of British Telecom Synergy 4500 from The average user rating for this product is 1.6/5, compared to an average user rating of 4.1/5 for other Cordless Phones on

11% of the reviews on give this product a positive rating.

May, 2018

Product Specifications

The Synergy 4500 from BT is one of the sleekest telephone handsets around, with a matt black finish, and is feature packed with virtually all the functionality you could require from your home handset. You can copy your mobile SIM card to your home phone, meaning that not only do you have the convenience of being able to have all your favorite numbers on hand, without having to re-key them all into the handset, but you are also making a safe copy of your contacts, so that if you lose your mobile, you're not losing all your precious numbers. The Synergy 4500 twin also has a digital answering machine, and a massive range of 50 meters indoors, big enough for almost any house - furthermore with over 4 days standby battery life, you can carry it all round the house with you. You can also three way conference, with the other internal handset, and an external line, and you can make internal calls to either handset - perfect if you live in a house with three stories - no more shouting up the stairs!

Answering Machine

Answering System Type:Digital
Recording Capacity:11.5min


Standby Time:100 h/Up to 100 h
Talk Time:600 min/Up to 600 min

Call management

Call waiting: Yes
Conference call: Yes
Explicit call transfer: Yes


Backlight buttons:No / Yes
Colour of product:Black


Backlight colour:Blue
Display number of colours:Monochrome
Display number of lines:4
Type:LCD display


Model:4500 SMS/4500 SMS quad/4500 SMS trio/4500 SMS Twin/4500 Trio
Packaged Quantity:1
Product Line:BT Synergy


Battery capacity indicator: Yes
LED on base: Yes
LED on handset: Yes

Management features

Alarm Clock: Yes
Volume Control:Digital


Call list capacity phonebook:50
Phonebook capacity:255
Redial list capacity:20
SMS storage capacity:50


Colour:Matte black

Other features

Camera included: No
Mac compatibility: No


Answering Machine: Yes
Base station memory card reader:SIM
Maximum indoor range:50
Maximum outdoor range:300
Recording Time:11 / 11.5

Phone features

Dialer location:Handset
Microphone mute: Yes
Multi base capability:4
Multi handset capability:5
Polyphonic ring: Yes
Speakerphone: Yes

Ports & interfaces

Wireless Connection:No / Yes


Battery Capacity:750
Battery technology:Nickel-Metal Hydride (NiMH)
Battery Type:AAA
Standby time:100
Talk Time:10

Service & Support

Type:1 year warranty


Conference Call Capability:3-way/Yes
Cordless Phone Standard:DECTGAP
Dialer Type:Keypad
Header Features:W/ call waiting caller ID & answering system
Type:Cordless phone

Telephone Features

Caller ID:Built-in / Yes
Handset Locator:Built-in / Yes
Intercom:Built-in / Yes
Speakerphone:Built-in / Yes
Voice Mail Capability:Built-in / Yes

Weight & Dimensions

Base dimensions:120 x 160 x 50 / 140 x 150 x 120
Base weight:208 / 630
Handset dimensions (WxDxH):50 x 25 x 150
Handset weight:122