If you own AirPods then this is the perfect hack for you! I just recently found out that they have the ability to live listen. Basically what this means is that you can eavesdrop as long as you don't go too far away from your phone... you're welcome! NOBODY IS SAFE!
Thanks to Apple, here's the steps you have to take to get ya creep on!
1. Go to Settings > Control Center > Customize Controls.
2. Scroll down until you see Hearing and tap the green Plus button next to it.
3. Next, go back to the home screen. Swipe up to reveal Control Center, and tap the ear icon.
4. In the menu that appears, tap Live Listen to turn it on.
And yes, it actually works. I just tested it out and honestly I was shook.