Iphone 4 keeps saying Telstra Sim Card locked once in 24 hours

During a 24 hour period at least once a day I am getting Sim Card locked.
Carrier is Telstra.
Seems to be getting worse (2 or 3 times) and happens when you can least afford it.
I Power off and unlock and it comes good for a non repetative period.
Regards
Barry

Took IPhone to Apple Store and was replaced within a few minutes.
Problem solved.

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