Iphone 4s not recognising new sim card keeps saying sim not valid?

iphone 4s not recognising new sim card keeps saying sim not valid. Can anyone advise me please?

There are three possibilities:
1.  Your phone is locked to a different carrier and will not work with any SIM card except those from that carrier.
2.  Your new card is from a carrier not supported by the iPhone.
3.  Your new SIM card is defective.
In order to determine which is the right answer you could try a different sim from the same carrier or try your new card on a different iPhone.   Also check to make sure your new carrier is a supported carrier.

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