While your intentions are undoubtedly good, invading someone's privacy can damage trust and create more problems in the long run. Maybe you could try talking to your friend openly about your concerns and offer your support in a non-intrusive way? I believe that your intentions clearly show that you care without forcing them to reveal anything they're not ready to share. Ultimately, trust and open communication are crucial in any relationship, and respecting boundaries is a sign of true friendship. You see there are sms trackers
https://www.linkedin.com/pulse/top-7...e-claire-york/ that can simply help you. If your intentions are good than i guess it is ok to do this way