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Question: SIM 1 Problem

I have a new dx900 and when making call from sim 1 it immediately disconnects after called number answers. Swap sims and got same result. Happens on inbound calls too. Comments - suggestions. Does anyone know how to contact ACER directly on this? SIM 2 works well. the following user board shows others with same problem: http://eten-users.eu/index.php?showtopic=19050