If we haven't taken the time to lock down our privacy settings on phones, we may be giving away our location without even knowing it. Malicious third-party actors, applications, and data brokers love when people do this. Patterns of life are built based on where you go throughout the day.
I-Phone users, follow the steps to lock down your location and ensure significant locations are turned off. Android coming soon!
A complete Android/Google location settings review can be located here:
https://www.theverge.com/21401280/android-101-location-tracking-history-stop-how-to
This is a long but comprehensive guide on how to delete all saved locations as well as limit what is being tracked in the future.