There are a few reasons why your SIM might not work.
Here are some answers to help you
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My BT Mobile SIM card doesn't work -
BT Mobile: How do I order and activate a replacement SIM? You can do this online but you need to activate your SIM as soon as you get it.
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I've put my SIM in but BT isn't on the list of mobile providers to choose If BT isn't on the list, just choose any mobile provider. Your service will work fine.
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