Free codes that "work" are either scams (phishing for your Google account) or temporary exploits that destroy your phone's ability to use the app long-term.
Open Sygic → → Sygic Store → Activate/Restore → Restore (for Google Play/App Store purchases). 2. Important Guidelines for Activation Codes sygic premium activation code work
contact Sygic support directly — they're responsive. Free codes that "work" are either scams (phishing