Sorry to hear that @Ale1 . First go into your self service account and use the lost /stolen feature to deactivate your account. You can also contact the moderators and ask them to place your phone on the blacklist. When you have the new SIM and phone, then take your phone off lost stolen. And do as @ddeep91 suggests.
Also, think about what may be exposed because of the lost phone. Email addresses, bank, credit card information. And change passwords accordingly.
