How to activate a Three Mobile key?

1 min. readlast update: 06.10.2025

Activating a Three Mobile key is really simple, just follow these steps:

  1. Call 444 (a free number) from your Three phone.
  2. Select €˜Top-up with a voucher'.
  3. Enter the received voucher number.
  4. Done - your account will be topped up.

The key is not working

If you have activated the key according to the guide but the code appears not to work, please check what type of error message you receive and depending on it follow the appropriate instructions:

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