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I put a new sim card in my nokia lumia 900 and the sim is saying invalid sim now

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I put a new sim card in my nokia lumia 900 and the sim is saying invalid sim now

 
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Re: I put a new sim card in my nokia lumia 900 and the sim is saying invalid sim now

Hi! Try this link and let me know if it helped. Troubleshoot your device

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*I am an AT&T employee and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.
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Re: I put a new sim card in my nokia lumia 900 and the sim is saying invalid sim now

Not that uncommon. I had to go to an AT&T store to get another sim card for my out of the box Lumia 920.

The one that came with the phone was bad. Call customer service if the link doesn't help.

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Contributor

Re: I put a new sim card in my nokia lumia 900 and the sim is saying invalid sim now

I just had the same thing happen with the SIM that came in my out-of-the-box Lumia 920, which is extremely inconvenient because now both phones are completely useless to me until customer service opens!  Not terribly impressed with ATT right now. 

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