Cancel your Three Broadband subscription by mail
To end a Three Broadband subscription you write to them: Three Broadband handles cancellations by post. Three Broadband receives written requests in Glasgow, United Kingdom.
Let Postbye cancel Three Broadband for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Money-back guarantee within 10 business days.
Postbye is not affiliated with Three Broadband.
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- 3 Three Broadband cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Three Broadband by mail
Collect the details you need
Put the account number, the phone number or service address being cancelled and the name on the account in front of you before you write: the request to Three Broadband is only as good as the details it quotes.
Write your request
Your Postbye letter to Three Broadband asks for three things: the account closed, no further charges and a written confirmation, all under “Subject: Cancellation Request – [your name]”. It comes from our English template.
Mail it with tracking
Send it certified to Glasgow, United Kingdom, copying the address from the next section letter for letter, and keep the receipt slip.
Keep the proof of delivery
Once the letter is delivered, the date on the receipt is the date Three Broadband was told. Compare it with your statements over the next billing cycle.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Three Broadband cancellation letter goes
For a letter to Three Broadband, use PO Box 333, G2 9AG Glasgow, United Kingdom.
“PO Box 333” is a post-office box or mail-sorting line, so it takes post and not couriers: certified mail is the right way to reach it.
The letter is addressed “To Whom It May Concern,” and its details block uses the labels Account holder, Billing address on file and Email on file.
Prefer to write it yourself? Use our letter template
Every address we hold for Three Broadband, with the envelope wording
Before you cancel Three Broadband, check these
- Name the exact line or service address. Accounts with several lines can leave one of them running.
- Ask for a final bill in writing and return any rented equipment by tracked mail.
- Check for an early-termination fee or a remaining equipment balance before the cancellation date.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel Three Broadband for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Cancelling a phone or internet plan
Phone and internet providers tie cancellation to contracts, equipment balances and notice periods, so the request should name the exact line or service and ask for a final bill in writing.
If a charge shows up after you cancelled, the letter and its receipt are what you put in front of the company or your bank.
Open three.co.uk and look at the billing section: if a partner collects the payment, the request has to reach them too.
Three Broadband cancellation at a glance
- How Three Broadband accepts cancellations
- By mailed letter
- Mailing address on file
- Three Broadband PO Box 333 G2 9AG Glasgow United Kingdom
- Country
- United Kingdom
- Letter language
- English (template en-generic)
- Website
- three.co.uk
- Category (from the company name)
- Phone & internet
- Added to the database
- May 7, 2026
- Data last checked
