The TextNow v6.7.0.1 Premium APK from "repack-software.site" is highly outdated, functionally limited, and poses significant security risks, with reports linking such sources to malware and Trojan-embedded installers. While claiming "premium" features, these modified APKs are often mislabeled versions of the 2ndLine app and cannot unlock server-side features like two-factor authentication or permanent number locking. For secure and full functionality, users should only use the official TextNow app and its legitimate, in-app Ad-Free+ subscription.