My iPhone just said "SIM failure" and now says Invalid SIM in the upper corner. What's this all about?

My iPhone just said "SIM failure" and now says Invalid SIM in the upper corner. What's this all about?  Any ideas on how to resolve this.

Looks like the Sim card had a catastrophic failure. Burnout, short somethng like that.
You can try to take out the tray and reseat the sim card inside and see if that gets it back.
Also try resetting the phone at least once by holding down the home and power buttons until the Apple Logo shows up.
If none of this works you'll have to contact your cell carrier to get a new sim card, as it probably fried and is no longer functional.

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