Cancel your Three subscription by mail
Three accepts written cancellation requests by post, which makes certified mail the strongest proof that you asked. Three receives written requests in Reading, United Kingdom.
Let Postbye cancel Three 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.
- 4.8 from 2,931 reviews
- 2 Three 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 by mail
Start with your account details
Start with the account number, the phone number or service address being cancelled and the name on the account, so the request to Three names the right account the first time.
Set out the request
Ask Three to cancel the account, stop all further charges and confirm in writing. Postbye prepares the letter from our English template, with the subject line “Subject: Cancellation Request – [your name]”.
Mail the letter with a receipt
Use certified mail for the RG2 6GF Reading address in the next section, so the post office records the delivery. Write down the tracking number.
Save the tracking record
File the receipt with the letter. A Three charge dated after delivery is the one to dispute, and these two documents are what you quote.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Three cancellation letter goes
Three lists 450 Longwater Avenue, RG2 6GF Reading, United Kingdom as its mailing address.
Copy the postal code RG2 6GF exactly: it is what routes the letter to Reading, United Kingdom.
The letter greets the reader with “To Whom It May Concern,”; your own details sit under the labels Account holder, Billing address on file and Email on file.
Prefer to write it yourself? Use our letter template
Before you cancel Three, check these
- If you are moving to another provider, keep the line active until the new service works, then cancel.
- 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.
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 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.
Three cancellation at a glance
- How Three accepts cancellations
- By mailed letter
- Mailing address on file
- Three 450 Longwater Avenue RG2 6GF Reading United Kingdom
- Country
- United Kingdom
- Letter language
- English (template en-generic)
- Category (from the company name)
- Phone & internet
- Added to the database
- May 7, 2026
- Data last checked
