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How long can the extension be?

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How long can the extension be?

There is no upper limit to the length of extension you can plug in to your BT telephone socket.

 

The standard sizes, 3m, 5m, 10m, 15m and 30m telephone extension cables available should be fine, and will certainly be sufficient for most users.

 

Wireless modems / routers are also available at reasonable prices.