Use the full area code before the local subscriber number.
UK geographic telephone code
01245 area code: Chelmsford
The 01245 dialling code is associated with Chelmsford.
How to dial Chelmsford
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 01245 numbers
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Called six times, asking to speak to a different person each time. We politely told them we were not interested, but they just laughed. It appears to be some kind of aggressive marketing or scam call. We ignored the final call, but they kept the phone ringing for so long that we eventually had to unplug it.
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missed called from them but my number was blocked so not sure who they are - suspicious that no incoming calls allowed so obviously a call centre
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rings on and on, is probably a software originated call and may not even be Chelmsford. Avoid at all costs
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Annoying and telesales
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The caller is telemarketer with a very strong Indian accent. Spam.
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Solar power sales call
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Sileycall.
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called me twice @ 7.30 this morning
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Keeps ringing me. It goes to answer phone. No message left
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01245330865 knows all identity clearly hacking and manipulation of o2 been hidden in the background since I opened the O2 account. Trying to convince me they car ppb something like that.
Source and review
This page uses Ofcom telephone area codes area-code information retrieved on 3 September 2026.