My phone has been switched off since it died last night, I charged it and switched it back on tonight and the phone is saying insert SIM, my SIM is working in my husband’s phone but not in mine and his SIM won’t work in mine either. Why my Samsung E900 is asking for SIM when I have already inserted it? Is there something I can do to fix it as there are lots of things on the phone which I need? I would really appreciate your useful information regarding this. Thanks.