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Windsor has number portability agreements with the following operators:

BT Cable & Wireless Virgin Telewest Opal Energis
THUS Gamma TelecomNTL Redstone


08 Number Porting
  • BT
  • C&W (Inc. Thus and Energis)
  • Virgin (Inc Telewest and Ntl)
  • Opal
  • Redstone
  • Gamma
03 Number Porting
  • BT
  • C&W (inc. Thus and Energis)
  • Opal
  • Redstone
01/02 Geographic Number Porting
  • BT
  • C&W (Inc. Thus and Energis)
  • Gamma

Please note: Windsor will need to check that your telephone numbers can be ported.

How Does Porting Work? »

The rules for transferring numbers are set out by Ofcom (The industry regulator). All network operators must abide by the regulations.

  • Windsor will manage the whole porting process for you
  • You must ensure there are no outstanding bills on your existing account
  • Download the correct form from the right of this page
  • Fill in the Customer Information section with Company name, Address, Account
  • Enter number(s) to be ported with terminating numbers
  • Sign, date and print the form on company letterhead
  • Fax the authorisation letter, porting form and recent invoice/bill from your current supplier to 0333 123 8484
  • We will contact your existing provider for you and submit your porting request
  • The transfer request covers activation of your new account and disconnection of your old one
  • You will receive communication from both parties confirming your request
  • Numbers are typically ported to Windsor within 10-20 days

FAQs Regarding Number Porting »

Q. It is too difficult to contact my current supplier. What should I do now?

Do not worry - the only thing you need to do to port your numbers is give us your consent.

Q. Will there be a disruption in service?

Number porting is a straightforward proceedure for both non geographic and geographic numbers , however there are some differences in the ways the ports need to be processed:

Non Geographic numbers are already on the intelligent network and therefore the change over should be seamless.

Geographic Numbers need to move from the standard network onto the intelligent network and therefore there may be a short period of downtime, we are unable to guarantee when this will be, but we will endeavour to keep any disruption to a minimum.

Q. Who is Windsor Telecom?

We have been providing telephone numbers and inbound call solutions since 1999 and have pedigree as one for the most trusted providers in the UK. Visit our about page to find our more about us.

Q. What does porting a number mean?

Number porting is the process by which telephone numbers are transferred between operators. If you already have a telephone number with another provider, but you would like us to maintain and provide services for that number then you must port it to us.

Q. How do I port bulk numbers or a block of numbers?

Yes, simply use the form to the right of this page. If the numbers will not fit on the form, please use a continuation sheet. Numbers ports are managed in 100 number blocks, so if you have say 500 numbers to port, this may take a little longer than normal to facilitate.

Q. Can porting be reversed?

You can cancel a port up to 24 hours before the porting date. This will incur at administration charge of £50.

Q. What happens if I need to change the date that the port is booked in for?

It is usually possible to change a port date in terms of pushing it back but not in terms of bringing it forward. A port date can be changed upto three time, if the third date is not acceptable the port will need to be withdrawn and re-submitted , a charge will be raised for this.

Q. Can I port services in addition to my number?

If you have any other services provided by your current supplier, such as (but not limited to) ADSL or Redcare, porting the number away may cease these services and you may need to pay additional charges to get them reconnected. You will also loose access to any services provided by your old telecoms supplier, such as voicemail. However, we provide first-class products to make your Windsor number work harder, such as free voicemail to email and instant rerouting. These are widely regarded as the best in the market. Click here to find out more.


The process of number porting is something we have had years of experience to perfect, which means you are in safe hands. Mandy Hill, Head of Partnerships will invest her time in understanding your business and your customers.

Together you can devise a plan to add value to your customer base. Once you are a Reseller you will have full access to our Customer Service Support Team and our IT Team. To find out more about Windsor Reselling please call Mandy Hill on 0333 123 5020 or fill the enquiry form to the right.

GET YOUR FREE RESELLER INFO PACK TODAY

Becoming a Reseller is easy & could be very financially rewarding for you. Please complete the form below to receive your free Reseller Information Pack.

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1st Floor, Tilford House
Farnham Business Park
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