1) the sim tray wasn't bent
For the last two things they told me that they must send it to their laboratories and see what happened with my iphone but they also told me that this isn't covered by warranty because " Apple is not responsible for damage arising from failure to follow instructions relating to the Apple Products use." In their opinion the problems which involve my SIM card exist because I didn't follow the instructions in the right way ..
But I followed the instructions in the right way because the sim works fine
They verified if the mechanism which openes the sim tray works fine (and it does) and tried to take out the sim without dissasembling the phone but they couldn't .. So they told me that it is not a problem related to the iPhone's hardware and if I want to fix it I must pay even if the phone was activated the day before and had the original protective film on it .. I'm from Italy ..

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Read my post bellow .. It didn't have any physical damage ..I don't know why and I am very angry because I've paid a lot of money this phone