Essex · CO postcode area
Business phone systems for the CO postcode area
CO covers Colchester and the surrounding parts of Essex, on the 01206 and 01255 dialling codes. We set up cloud phone systems and local numbers for businesses right across the area, from £19 per user a month.
Where the CO postcode area covers
The CO postcode area is named after Colchester and stretches across Essex. Towns inside it include:
- Colchester
- Clacton-on-Sea
- Halstead
- Frinton
Phone numbers here normally start 01206 and 01255. Because our lines are cloud based, the postcode of your premises doesn't limit which number you can use — you can keep a 01206 number if you move office within Essex, or add a second number for another town entirely.
Postcode boundaries and dialling code boundaries don't line up exactly, so a few addresses at the edge of CO sit on a neighbouring code. If you're not sure which applies to you, tell us your address and we'll check before you order.
What you get
Phone lines for Colchester businesses
Works on the phones you have
Calls ring your mobile, a desk phone or both — no engineer visit.
Keep your local number
We port your existing number free, so nothing you've advertised changes.
From £19 per user a month
UK landline and mobile calls included, rolling monthly, no line rental.
Ready for the switch off
Cloud lines replace PSTN and ISDN before the copper network retires.
Switching
Moving a Colchester business off old lines
Most businesses in CO are still on copper PSTN lines or an ISDN system that has to be replaced before the network is retired. Swapping to a cloud system removes line rental, keeps your existing number and gives you call routing, voicemail-to-email and a mobile app on the same plan.
Porting your number takes around 5 to 10 working days. Your old line keeps running until the port completes; on cutover day there is a short window where calls may not connect, so we agree a time with you and recommend pointing a mobile at the business in the meantime.
FAQ
CO postcode questions
Yes. Setup is remote, so we cover every CO postcode — Colchester, Clacton-on-Sea, Halstead, Frinton and everywhere between. No engineer visit is needed.
Next steps
Related pages
Colchester phone systems
Prices, numbers and switching for Colchester businesses.
Business phone systems in ColchesterAlso see every UK postcode area we cover, how a UK business VoIP system works, what replaces an ISDN line, this month's business phone deals and full plan pricing.
Get a phone system quote for CO
Same-day quote. Free number porting and free setup on the current offer.