> The only thing GCM does is wake up a device to connect to the Signal server when the app is running in the background, nothing is actually transmitted over GC

> The only thing GCM does is wake up a device to connect to the Signal server when the app is running in the background, nothing is actually transmitted over GCM. I consider myself an educated Signal user and I had no idea about that. Preach it, shout it, this is great for everyone who thought "GCM == messages"!