The operator says that the hackers got customers' name, surname, phone number, email, date and place of birth, nationality, and address. They also have the SIM Integrated Circuit Card Identification Number (ICCID) - a unique number providing the card's country, home network, and identification.

Combined, these details can be used for SIM-swapping attacks that enable hackers to assign a victim's phone number to a SIM card in their possession and thus receive the target's calls and text messages.

Well, that's not good.