Hi @Checho1, sorry to hear about this.
Your post has been translated 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.
Could you possibly elaborate your question a bit? For example, do you receive any kind of error message when you try to place a call? Have you tried changing the preferred network type in the settings of the phone? Have you tried to reboot your phone in safe mode to see if the calls work better there? Also, trying another SIM card as @uliwooly is a good troubleshooting measure.
Please do elaborate and I will do my best to assist you!
