Hi @Kty4, sorry to hear about this. 
I have translated your question to English as this is an International forum, please post any replies in English and it will be easier for me and other users to assist you.
Have you tried removing the SIM card from the device and then inserting it again? If you have tried that, check if you are able to get a network connection with a new or different SIM card, for example if a friend, colleague or family member have one in the same size as yours, you can try inserting that one.
Let me know how it goes!
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