My daughter started staying late for clubs and one evening her phone went straight to voicemail, which had me worried sick. She is fine, but it made me realize I want a simple way to know where a phone is when plans change. Does anyone have a cell phone tracker they trust and would recommend from real use?

That’s completely understandable. Many families use Find My (for iPhone) or Google Location Sharing (Android) since they’re built-in and reliable. Life360 is also popular and works on both. Best approach is mutual location sharing for peace of mind, not monitoring PolyTrack