Looking for app that can GPS track non-Android devices

[billdz]

Hello,

I'm looking for an app that can GPS track non-smart phones. The app Find My Friends appeared to fill this need, as its page on Google Play says: "Just send non-smart phone users an invite via text. Once they reply with a 'yes' their icon will appear on the app’s map." See https://play.google.com/store/apps/details?id=com.fsp.android.friendlocator

But this appears to be incorrect. The FAQ says you can only connect with those who have the app installed on their phone. If it exists, could someone please recommend an app that allows tracking of non-smart phones.

Thanks,
Bill