Why won't my SIM card work in a different iPhone 4?

I have a white iPhone 4 and my SIM card works fine in that phone but I would like to change to a black iPhone 4 but the SIM card does not work. It either says "Inactive SIM" or "No Service". Can someone please help?

in which case there is something amiss with the black one
Check this document
http://support.apple.com/kb/TS4148
You are sure both work successfully on O2 ( UK)

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