My first one was a Samsung Galaxy S1 that I got in 2013 and it was a great little device that was easy to open up and repair. It had only 512MB of RAM but that was plenty for basic phone needs, web browsing and running some Android apps like AnkiDroid at the time.
Nexus One was my first Android phone. I miss the trackball every day… so handy for moving the cursor through text. And it doubled as a notification LED! So sweet. Plus the removable battery, shit was awesome. I still have it in a box somewhere. I’m on a Pixel 7 now.