First of all, I love my DexCom. It has changed my life, especially while cycling. I have been an athlete most of my life and the Dexcom has prevented me from getting low. I was disappointed that the G4 is so difficult to see in the sun. I can barely read the number and cannot tell which direction the arrows are going without stopping and trying to find some shade(not always convenient when your racing). It seems the more high tech they make the screens on pumps and CGM, the harder it is to read in the sunlight. Any ideas?
I have the same problem with the Animas Ping pump screen. I find wearing polarized sunglasses makes it worse. I hope that better screens will be possible in the near future. My iPhone is easily visible in the sun! That being said, this technology (Ping + G4) makes my life better.
...and if things go according to the (Dexcom) plan, the next rev will be running on your iPhone instead of a separate device. We shall see. In any case, I think it's a ways out since the G4 just came out. I have no ideas for you on the sun/screen thing, sorry. It is a pain.