T-Mobile users are receiving legitimate security text messages, but security experts advise caution. While the texts are genuine, the practice of sending links via SMS for security purposes is inherently risky. Users should be wary of clicking on links in text messages, even if they appear to be from a trusted source. It is recommended to independently verify any security alerts by visiting the company's website or contacting customer support directly, rather than relying on links provided in text messages. This highlights the ongoing challenge of balancing security with user convenience.