Does your phone have any network branding on it? It could be that it is SIM locked to a network... it is also possible that the connectors between the phone and the SIM card are not touching completely, which would make the phone think that there was no SIM card in it.
You may like to sign up and post your question in the Galaxy Ace sub-forum Samsung Galaxy Ace - Android Forums where you would be able to give more details and get hints and tips from other members who have the same phone
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