Use the full area code before the local subscriber number.
UK geographic telephone code
02871 area code: Londonderry
The 02871 dialling code is associated with Londonderry.
How to dial Londonderry
Use +44 and remove the leading zero from the area code.
An area-code match describes the number range, not the caller's identity or current physical location. Caller ID can also be spoofed.
Recent reports for 02871 numbers
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Reported as being located in Northern Ireland and several reports of it being a scam call.
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No idea who it was calling as I never answered. Don't trust it as for some reason, although I never answered, the amount of credit that is left on my phone showed up after they rang off. No money was taken from the phone but just find it weird it shows up on my phone although I didn't answer the phone. Have added it to the blocked numbers.
Source and review
This page uses Ofcom telephone area codes area-code information retrieved on 3 September 2026.