WhatsApp collects various categories of data to operate its service, and some of this data is shared with other Meta companies.
Data WhatsApp Collects (Regardless of Meta Sharing):
According to WhatsApp's Privacy Policy, it collects information to operate, provide, improve, understand, customize, support, and market its services. This includes:
Account Information: Your phone number (required for registration), profile costa rica phone number list name, profile picture, "about" information (status message).
Your Contacts: WhatsApp accesses your device's address book (with your permission) to help you connect with other WhatsApp users. However, WhatsApp explicitly states that it does not share your contact lists with Meta for Meta's own purposes (like ads). It processes the phone numbers in a hashed format to identify WhatsApp users among your contacts.