Due to marketing b*******, most things labeled as 3G are actually 2G.So networks don’t support both two and three g. Then things that are actually 3G like hspda and L.T.E are marketed as four g , so it’s just very confusing between all of it. They want to shut down the 2G.Networks that are edge and gsm.And they want to shut down the one g network that’s cdma. Depending on your service that could be marketed as 123 or even four g.
You can leave 10% of the drive unformatted. A good drive will move rarely written cells data to high use locations. You could also reformat every couple years and instal based on the least changing stuff first. Next time you buy an ssd stay away from qlc or plc as they have less lifetime. Tlc is about as good as you can get now.
For now, I would retire that drive and use it for games you don’t uninstall.
Write endurance is based on the entire drive. If you had the drive mostly full, fully formatted with no overprovisioning, and kept using a small portion of the drive, it matches your expected lifespan. You maybe did a little better than expected.
Downloading a copy would not be illegal in the US. Uploading a copy to someone would likely be illegal.