Iphone 5 invalid sim

Just received new unlocked Iphone 5 from Apple store and getting "invalid sim" message with sim card still works ok in original Iphone 4. Have tried reinserting multiple times and all the reboot atempts advsed in some of the forums but still no good. Have done the full activation process with ITunes
Replacing with another SIM is not an option. SIM is OK It still works fine in old phone.
Does anyone have any suggestions to get my new phone working with original sim? Any help much appreciated.

Ocean20 is correct; the iPhone 4 and iPhone 5 use different-size SIMs, so there's no way you could be using the same SIM in both phones unless you have some sort of adapter to use a nano-SIM in a micro-SIM phone. Is that what you're doing?
And in what country and from what store did you purchase this iPhone?

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    I would like to know how to get my iphone on if it goes into a no service mode and shows as invalid sim, I would like to know how to get my iphone on if it goes into a no service mode and shows as invalid sim

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