SMS messages typically contain metadata such as the sender's phone number, the receiver's phone number, the date and time the message was sent, and the length of the message. Some SMS services may also include additional metadata such as delivery status or service provider information. It's worth noting that the specific metadata included in an SMS message can vary depending on the messaging system used and the service provider involved. Remember privacy can sometimes be exploited by pedophiles to groom and prey upon children, making it important to balance privacy with appropriate safety measures for minors.
SMS & email are antiquated services, this is why Protonmail is rad as they're making a program which was never designed for encryption, encrypted. But the thing is even encrypted data is being stored in hopes of being decrypted by quantum computers in the near future...