Despite the rise of Internet Protocol-based messaging services with the advent of smartphones, SMS continues to see widespread use. However, this persistence raises concerns about its safety and privacy implications.

SMS lacks end-to-end encryption, with messages typically transmitted in plain text. This leaves them vulnerable to interception by anyone with the necessary expertise. Even if a mobile carrier employs encryption, it's often a weak and outdated algorithm applied only during transit.

SMS relies on Signaling System No. 7 (SS7), a set of signalling protocols developed in the 1970s. This aging technology is highly insecure and susceptible to various cyberattacks. Instances of hackers exploiting SS7 vulnerabilities for malicious purposes have been recorded.

SS7 security holes have not been adequately addressed, potentially due to government interest in monitoring citizens. This raises concerns about governments having the ability to read SMS messages. In the U.S., law enforcement can access messages older than 180 days without a warrant, despite efforts to change this.

Carriers retain SMS messages for a defined period, and metadata is stored even longer. While laws and policies aim to prevent unauthorized access, breaches can still occur, potentially compromising user privacy.

Once sent, SMS messages cannot be retracted. They persist on the recipient's device indefinitely, unless manually deleted. This lack of control raises concerns about the potential exposure of sensitive information in cases of phone compromise or hacking.

Several secure messaging apps provide safer alternatives to SMS:

 

Signal is a leading secure messaging app known for its robust end-to-end encryption, ensuring only intended recipients can access messages. Developed by the non-profit Signal Foundation, it prioritizes user privacy and does not collect personal data.

Telegram offers a solid alternative to SMS. While messages are not end-to-end encrypted by default, users can enable Secret Chats for enhanced security. This feature prevents forwarding and limits access to messages, photos, videos, and documents.

Despite its affiliation with Meta, WhatsApp is a popular alternative with billions of active users. It employs end-to-end encryption for message security, surpassing the safety provided by SMS. It's available on major platforms and is widely used among contacts.

In conclusion, SMS is not a recommended option for individuals concerned about personal cybersecurity and privacy. While it offers convenience, its security shortcomings are significant. 

Secure messaging apps with end-to-end encryption are superior alternatives, providing a higher level of protection for sensitive communications. If using SMS is unavoidable, caution and additional security measures are advised to safeguard information.