Hi @Linmaoju,
Sorry to hear your SIM has stopped working. There's not a lot of information to go from in your post though, so we will need to ask you a few questions.
When you say the SIM has stopped, is there an error like "SIM registration failed" or have you been able to test the SIM in another phone to confirm that this seems to be a SIM card issue?
Are you unable to use any services or is it an issue with sending/receiving calls, texts, and/or data?
If you can let me know on the above we might be able to give more specific advice.
Or, if you're near a Three store you can get the SIM replaced there, make sure to bring a photo ID if you want to transfer your existing number. You could also chat with the PAYG team so they can do more detailed checks.
Thanks,
JonathanB
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