Use the full area code before the local subscriber number.
UK geographic telephone code
01600 area code: Monmouth
The 01600 dialling code is associated with Monmouth.
How to dial Monmouth
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 01600 numbers
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just a name colin no reason
Source and review
This page uses Ofcom telephone area codes area-code information retrieved on 3 September 2026.