IPhone 4S unlock - reject SIM card. How to fix?, iPhone 4S unlock - reject SIM card. How to fix?

Hi there
I bought an iPhone 4S unlock. 1st time after I putted the SIM card in, it works for 10minute and then rejected. It showed: Invalid SIM card or :No SIM cared instatalled".
How do I fix it?
Thanks
Chi

It's a very common problem, you can find a discussion here by searchin phrase "Invalid SIM card" or what ever your iPhone tells.
Its NOT related to locked or unlocked device.

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