How to get unlimited Google Photos storage for life

Google started offering free photo backups in 2015 when the current iteration of Google Photos was freed from the dead weight that was Google+. At the time, Google said you could upload as many photos as you wanted in a compressed format, but the first-gen Pixel in 2016 had a nice bonus: unlimited full-resolution uploads. Google sadly has just ended free uploads to Google Photos—everything you save going forward counts against your storage cap... unless you've still got a first-gen Pixel. Here's how you can use that phone to keep the free upload gravy train running.