Hello, Rebecca.
Welcome to the Three Community.
Ah, that's not so good. You can contact the team to report the SIM lost, and they can order out a replacement SIM for you. If you have a phone that supports eSIM, the team can send you an email with a code to download your eSIM instead, which is much faster than waiting for one to be delivered. Alternatively, you can pop into a local store with Photo ID, and the store can issue you with a new SIM.
Pete.
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