I am using an iPhone 6 with Verizon as a carrier. I went into the mountains with my phone in airplane mode just to make sure the GPS functions that way as I understand it will greatly increase battery life- that is the way I will be using it on tour and I have a confused mother who will call me repeatedly. I opened Strava and there was a blank grid with my GPS ping, as I rode it made a line on the blank grid, could be a nice way to find your trail of breadcrumbs if you get lost. I went through a very small town but never bothered or thought to turn on cell reception. When I got home and off airplane mode it quickly filled in the map. I didn’t know that Strava and Google maps could communicate, nice to know, nor did I know Strava lets you preload routes, like I said I am new to this. A big Thanks to all!