I think I’ve posted the link to this video before, but this should help.
On Facebook there is a group called Spike App where you can search for answers to your questions or ask a question if you can’t find answers. Spike App | Facebook
The most important thing to know is that it is a bad idea to try to use the Spike App and the Dexcom G5 app at the same time because the transmitter will usually have communication errors. I usually go back to the G5 app after resetting my transmitter in Spike, but Spike has tons of great features if you’re willing to do the work to understand it.
The Spike App is only available through the website that is shared in the video. It is not available in the regular App Store. I just read on Facebook that the Spike website is down for maintenance but don’t know more than that.