My iPhone 4s. Keeps coming up sim invalid, I have to keep restarting my phone but doesn't help, it's only 5 days old and I'm fed up now with it now! Any solutions please?

My iPhone 4s. Keeps coming up sim invalid, I have to keep restarting my phone but doesn't help, it's only 5 days old and I'm fed up now with it now! Any solutions please?

There is obviously something not right... But to determine what the issue is, it needs to be looked at...
And the Apple Store would probably be the best place...
Just my opinion...

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