Mac, hope this helps.

What You Need to Do.
Wait for Contact: Your network provider will write to you before they move your service.

Power Needs: Digital landlines require electricity. If your home loses power, standard digital phones may not work unless you have a battery backup (especially important for vulnerable users).

Check Devices: Contact your provider if you use personal alarms, pendant triggers, or fax machines connected to the line.You can read official guidance on the UK Transition from Analogue to Digital Landlines or check details via Ofcom on Moving Landline Phones to Digital.