Updated my iphone and sim card not working anymore?

I recently updated my iphone 6plus and the sim card inserted in the phone is not working anymore. The device kept on showing "no sim card installed". But when i insert that sim card on my iphone X, it works.

Updating wipes any unlock codes you have used/applied. So your sim or phone may have gone back to a state where you had to unlock one or the other previously.

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