Hey, Daiv.
Welcome to the Three Community.
You can request one from the Support Team on chat or by calling the number shown there.
If you're already logged into My3, you should be able to request one there.
And as Geluk mentioned, you could also pop into a local store to get one. This is a good option because you can get the SIM immediately rather than waiting for it to be posted. If you decide to go into store for the SIM, please make sure to take photo ID with you.
Pete.
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