Sounds like the SIM card you are trying to use has been de-activated. It is either an 'older' type or has not been used for a long time.
Just double-check that the card is inserted properly, and the right way round - you never know!
You may have to get a new SIM card and activate it.
If you want to keep your old number, however, it may be worth calling your network provider and asking if they can re-activate the sim card that you have.
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