Android phone users are seeing a specific security warning within the Google Messages application that indicates when their conversations are not secure. This alert is directly related to the technology being used to send and receive the messages, prompting security guidance to delete certain types of texts.

The warning appears in conversations that use the older SMS/MMS standards instead of the newer Rich Communication Services (RCS) protocol. When a chat is not secured with end-to-end encryption, Google Messages displays an unlocked padlock icon and text that may read “Texting with [Phone Number] (SMS/MMS),” signaling that the conversation is vulnerable to interception.

Understanding the Google Security Alert

Google integrated end-to-end encryption into its Messages app for one-on-one conversations using the RCS protocol. However, when a user messages someone who does not have RCS enabled, or in group chats that do not yet support the feature, the app defaults to the unencrypted SMS/MMS standard. The visible warning serves as an explicit notification of this lack of security.

Security protocols for SMS/MMS do not include end-to-end encryption, a fact that makes these messages susceptible to various security threats. The technology has been a known target for surveillance and malicious attacks because the content of the messages is not protected as it travels through carrier networks.

Why Deleting Unsolicited Texts is Critical

The primary threat exploiting the lack of SMS security is “smishing,” or SMS phishing. Attackers send text messages impersonating legitimate organizations such as banks, delivery services, or government agencies. These messages often contain malicious links or urgent requests for personal information. Because SMS lacks robust sender verification, it is easier for criminals to spoof identities.

In response to receiving unsolicited or suspicious texts, especially in a chat thread where Google displays the “unencrypted” warning, cybersecurity best practices recommend immediate deletion. Engaging with these messages by clicking links or replying can expose users to malware, credential theft, and financial fraud. The warning from Google acts as a direct reminder that the communication channel is not secure, reinforcing the need for vigilance and the deletion of suspicious content.