BT says the work is 'essential' as it will replace technology that is fast becoming obsolete.
It is part of BT's Digital Voice project to replace analogue phone lines with digital ones.
Vicky Hicks, senior engagement manager at BT, said the benefits of the switch include advanced scam-call filtering capabilities and clearer call audio. "If you feel you need additional support with the transition, or you think you are vulnerable, please do tell us."
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