Vintage Bakelite phones require a professional conversion to work safely and correctly on modern UK telephone lines. However, once completed there are still some limitations you need to be aware of and we would recommend you keep a spare modern phone connected to overcome these:
Will a properly converted phone work on my telephone line?
Are there any other limitations if I have a BT line?
Why does it only work on a BT line?
Antique and Vintage phones with rotary dials use the early dialling method known as Pulse Dialling, Modern telephones with numerical keypads use Tone dialling (some have a switch to set back to the older pulse dialling method).
In the United Kingdom a BT phone line accepts both pulse and tone dialling, but the newer cable companies tend not to support tone (push button) dialling.
If your phone line is a non BT line (Virgin Media, Telewest, Talk Talk etc) then you will not be able to dial as their systems do not recognise the old dialling technology. The phone will still ring and you will be able to hold a two way conversation.
Can the phone be converted to work on a cable line?
Yes and No. It is possible and there are electronic products that can be fitted within the phone but beyond what we are prepared to do. It does add more complication to the phone and takes it further away from it’s original condition. If this is absolutely required we would recommend an external box solution and may be able to source one, please contact us if this is what you require.
A very kind soul contacted us recently to inform us and anyone else considering using a vintage GPO phone that some cable companies do in fact recognise pulse dialling: Dave from Lincolnshire contacted us to say: “I’m using Virgin Media and a 1956 312L fine with no other gadgets.” He offered some advice, which we agree with: “to test if your current set-up supports pulse dialling try ‘tapping’ out a number using an older or basic cheap phone that has the old button that is released when lifting the handset (to get the dialling tone) you can tap out the number with this button. 10 taps for a zero and 2 for 2, 3 for 3, etc. This mimics the pulse system. Dialling the talking clock by tapping is an easy way to see if the network supports pulse dialling.” We would recommend that if your supplier is not BT or Sky that you check the support of ‘Pulse Dialling’ before ordering. The number for the speaking clock is usually 123.