Here are a few things to try:
New SIM or SIM-swap not working
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Having trouble with a new SIM or SIM-swap? Here are a few helpful hints to get you talking, texting and browsing again.
What should I do if my SIM is not working?
What if my SIM is not working?
Putting your SIM in a new device?
Putting your SIM in a new device?
If you are, it might be locked to another network. You’ll get an error message or be asked to enter an unlocking code if it is.
If it is locked, get in touch with your previous supplier to get it unlocked.
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