I just lost my simcard tray.i this cover by the warranty coz i cannot use my phone.

[Plastada]

I just lost my simcard tray.i this cover by the warranty coz i cannot use my phone.

[najodleglejszy]

you might try contacting your local support, but since it seems to be a user error and not a manufacturing detect, I'm afraid they might refuse the warranty claim.

[Kunicross]

Loosing stuff is usually not covered by warranty but if you ask nicely you might get one for free or cheap depending on your local support - also there are usually spare parts for such stuff available and I would not expect such a part costing more then 10-20 $ or €. 

(I got a loading gate door for my old Z1 for 10 € at a local phone fix booth a while back.)