@almost50years Welcome to FUD! Fifty years means you’re doing something right. That’s awesome! I’m only at 48, but I’m almost there 
XDrip+ is a ten speed, while the Dexcom app is a tricycle. If you want to give it a whirl, go to:
You first will need to enable downloading from other sources on your phone.
Then, before opening the app, follow the instructions written by @Pastadude to get it to work with your S10.
If this seems too much for you, go here to make Dexcom work with ANY phone:
Just ask if you need any help. Us old guys need to stick together!